# In Re: Polar Bear Endangered Species Act Listing and 4(d) Rule Litigation - Mdl 1993

> District Court, District of Columbia · June 30, 2011

URL: https://www.frixlaw.com/law-library/cases/2664083

## Case

- **Court:** District Court, District of Columbia
- **Decided:** June 30, 2011
- **Precedential status:** Published
- **Opinion:** Opinion
- **Judges:** Judge Emmet G. Sullivan
- **Nature of suit:** Magistrate Case
- **Cited by:** 0 later opinions in the Frix Law Library

## Citator (automated)

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- Full citator and citing cases: https://www.frixlaw.com/law-library/cases/2664083

## How later opinions describe it (automated extraction)

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## Opinion text

UNITED STATES DISTRICT COURT
FOR THE DISTRICT OF COLUMBIA

)
IN RE POLAR BEAR ENDANGERED )
SPECIES ACT LISTING AND § 4(d) )
RULE LITIGATION ) Misc. No. 08-764 (EGS)
) MDL Docket No. 1993
)
)
This Document Relates To: )
)
Ctr. for Biological Diversity, )
et al. v. Salazar, 1 et al., )
No. 08-2113; State of Alaska )
v. Salazar, et al., No. 08-1352; )
Safari Club Int’l, et al. v. )
Salazar, et al., No. 08-1550; )
California Cattlemen’s Ass’n, )
et al. v. Salazar, et al., No. )
08-1689; Conservation Force, )
et al. v. Salazar, et al., No. )
09-245 )
)

MEMORANDUM OPINION

In May 2008, the U.S. Fish and Wildlife Service (“FWS” or

“the Service”) issued its final rule listing the polar bear as a

“threatened species” under the Endangered Species Act of 1973.

See Determination of Threatened Status for the Polar Bear (Ursus

maritimus) Throughout Its Range, 73 Fed. Reg. 28,212 (May 15,

2008) (the “Listing Rule”). The Service concluded that the

polar bear is likely to become endangered within the foreseeable

1
Pursuant to Fed. R. Civ. P. 25(d), Interior Secretary Ken
Salazar is automatically substituted as a defendant for his
predecessor, Dirk Kempthorne, who was sued in his official
capacity.
future because of anticipated impacts to its sea ice habitat

from increasing Arctic temperatures, which have been attributed

to global greenhouse gas emissions and related atmospheric

changes. Numerous plaintiffs have challenged the Listing Rule

under the Endangered Species Act (“ESA” or “the Act”), 16 U.S.C.

§§ 1531-1544, and the Administrative Procedure Act (“APA”), 5

U.S.C. §§ 551-559, 701-706, claiming that the Service’s decision

to list the polar bear as a threatened species was arbitrary and

capricious and an abuse of agency discretion. Pending before

the Court are the parties’ cross-motions for summary judgment.

As the briefing in this case makes clear, the question of

whether, when, and how to list the polar bear under the ESA is a

uniquely challenging one. The three-year effort by FWS to

resolve this question required agency decision-makers and

experts not only to evaluate a body of science that is both

exceedingly complex and rapidly developing, but also to apply

that science in a way that enabled them to make reasonable

predictions about potential impacts over the next century to a

species that spans international boundaries. In this process,

the Service considered over 160,000 pages of documents and

approximately 670,000 comment submissions from state and federal

agencies, foreign governments, Alaska Native Tribes and tribal

organizations, federal commissions, local governments,

commercial and trade organizations, conservation organizations,

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nongovernmental organizations, and private citizens. In

addition to relying on its own experts, the agency also

consulted a number of impartial experts in a variety of fields,

including climate scientists and polar bear biologists.

In view of these exhaustive administrative proceedings, the

Court is keenly aware that this is exactly the kind of decision-

making process in which its role is strictly circumscribed.

Indeed, it is not this Court’s role to determine, based on its

independent assessment of the scientific evidence, whether the

agency could have reached a different conclusion with regard to

the listing of the polar bear. Rather, as mandated by the

Supreme Court and by this Circuit, the full extent of the

Court’s authority in this case is to determine whether the

agency’s decision-making process and its ultimate decision to

list the polar bear as a threatened species satisfy certain

minimal standards of rationality based upon the evidence before

the agency at that time.

For the reasons set forth below, the Court is persuaded

that the Listing Rule survives this highly deferential standard.

After careful consideration of the numerous objections to the

Listing Rule, the Court finds that plaintiffs have failed to

demonstrate that the agency’s listing determination rises to the

level of irrationality. In the Court’s opinion, plaintiffs’

challenges amount to nothing more than competing views about

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policy and science. Some plaintiffs in this case believe that

the Service went too far in protecting the polar bear; others

contend that the Service did not go far enough. According to

some plaintiffs, mainstream climate science shows that the polar

bear is already irretrievably headed toward extinction

throughout its range. According to others, climate science is

too uncertain to support any reliable predictions about the

future of polar bears. However, this Court is not empowered to

choose among these competing views. Although plaintiffs have

proposed many alternative conclusions that the agency could have

drawn with respect to the status of the polar bear, the Court

cannot substitute either the plaintiffs’ or its own judgment for

that of the agency. Instead, this Court is bound to uphold the

agency’s determination that the polar bear is a threatened

species as long as it is reasonable, regardless of whether there

may be other reasonable, or even more reasonable, views. That

is particularly true where, as here, the agency is operating at

the frontiers of science.

In sum, having carefully considered plaintiffs’ motions,

the federal defendants’ and defendant-intervenors’ cross-

motions, the oppositions and replies thereto, various

supplemental briefs, the supplemental explanation prepared by

FWS in response to this Court’s November 4, 2010 remand order,

arguments of counsel at a motions hearing held on February 23,

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2011, the relevant law, the full administrative record, and for

the reasons set forth below, the Court finds that the Service’s

decision to list the polar bear as a threatened species under

the ESA represents a reasoned exercise of the agency’s

discretion based upon the facts and the best available science

as of 2008 when the agency made its listing determination.

Accordingly, the Court hereby DENIES plaintiffs’ motions for

summary judgment and GRANTS the federal defendants’ and

defendant-intervenors’ motions for summary judgment.

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TABLE OF CONTENTS

INTRODUCTION
TABLE OF CONTENTS
I. BACKGROUND
A. Statutory Background
B. Factual and Procedural Background
II. STANDARD OF REVIEW
III. DISCUSSION
A. The Service Articulated a Rational Basis for Its
Conclusion that the Polar Bear Met the Definition of a
Threatened Species at the Time of Listing
1. Plaintiff CBD’s Claim that the Polar Bear Should
Have Been Considered Endangered at the Time of
Listing
a. The Service’s Findings
b. Plaintiff CBD’s Arguments
c. The Court’s Analysis
i. Standard of Review on Remand
ii. Merits
2. Joint Plaintiffs’ Claim that the Polar Bear
Should Not Have Been Considered Threatened at the
Time of Listing
a. Joint Plaintiffs’ Argument that the Service
Failed to Demonstrate that the Polar Bear Is
67-90% Likely to Become Endangered
b. Joint Plaintiffs’ Argument that the Service
Arbitrarily Selected 45 Years As the
“Foreseeable Future” Timeframe for the Polar
Bear
B. The Service Articulated a Rational Basis for Its
Conclusion that No Polar Bear Population or Ecoregion
Qualifies As a “Distinct Population Segment”
1. The Service’s Policy
2. Plaintiffs CBD, SCI, and CF’s Claim that the
Service Wrongly Concluded that No Polar Bear
Population or Ecoregion Is “Discrete”
3. The Court’s Analysis
C. The Service Did Not Arbitrarily Fail to Consider Other
Listing Factors
1. Joint Plaintiffs’ Claim that the Service Failed
to “Take Into Account” Foreign Conservation
Efforts to Protect the Polar Bear
2. Joint Plaintiffs’ Claim that the Service Failed
to Rely upon the “Best Available Science”
a. Joint Plaintiffs’ Argument that Climate

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Science Is Too Uncertain to Support the
Service’s Conclusion
b. Joint Plaintiffs’ Argument that the USGS
Population Models Do Not Support the
Service’s Conclusion
c. Joint Plaintiffs’ Argument that the Service
Ignored Scientific Data and Made Improper
Findings Regarding the Southern Beaufort Sea
Population
3. Plaintiff CBD’s Claim that the Service Failed to
Consider Whether the Threat of Overutilization
Warranted Listing the Polar Bear As Endangered
(“Listing Factor B”)
4. Joint Plaintiffs’ Claim that the Service Wrongly
Concluded that Existing Regulatory Mechanisms
Will Not Protect Polar Bears despite Anticipated
Habitat Losses (“Listing Factor D”)
D. The Service Followed Proper Rulemaking Procedures
1. Plaintiff Alaska’s Claim that the Service
Violated Section 4(i) of the ESA by Failing to
Provide a Sufficient “Written Justification” in
Response to Comments
2. Plaintiff CF’s Claim that the Service Failed to
Respond to Significant Comments
IV. CONCLUSION

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I. BACKGROUND

A. Statutory Background

Congress enacted the ESA “to provide a means whereby the

ecosystems upon which endangered species and threatened species

depend may be conserved, [and] to provide a program for the

conservation of such endangered species and threatened species.” 2

16 U.S.C. § 1531(b). An “endangered species” is “any species

which is in danger of extinction throughout all or a significant

portion of its range.” Id. § 1532(6). A “threatened species”

is “any species which is likely to become an endangered species

within the foreseeable future throughout all or a significant

portion of its range.” Id. § 1532(20). The term “species” is

defined in the Act to include species, subspecies, and “any

distinct population segment of any species of vertebrate fish or

wildlife which interbreeds when mature.” Id. § 1532(16).

The ESA requires the Secretary of the Interior to publish

and maintain a list of all species that have been designated as

2
Under the conservation program established by the ESA, a
designation of “endangered” triggers a broad range of
protections, including a prohibition on “taking” individual
members of the species. See 16 U.S.C. § 1538(a)(1)(B); see also
id. § 1532(19) (defining the term “take” to mean “harass, harm,
pursue, hunt, shoot, wound, kill, trap, capture, or collect, or
to attempt to engage in any such conduct”). The Act authorizes
the Secretary to extend these prohibitions, in whole or in part,
to threatened species as well. Id. § 1533(d). In addition, the
Secretary shall “issue such regulations as he deems necessary
and advisable to provide for the conservation of [threatened]
species.” Id.

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threatened or endangered. Id. § 1533(c). Species are added to

and removed from this list after notice and an opportunity for

public comment, either on the initiative of the Secretary or as

a result of a petition submitted by an “interested person.” Id.

§§ 1533(b)(1), (3), (5). The Secretary of the Interior and the

Secretary of Commerce are responsible for making listing

decisions. 3 Id. §§ 1532(15), 1533(a)(2). The Secretary of the

Interior has jurisdiction over the polar bear. See 50 C.F.R.

§ 402.01(b).

A listing determination is made on the basis of one or more

of five statutorily prescribed factors:

(a) the present or threatened destruction,
modification, or curtailment of the species’
habitat or range;
(b) overutilization for commercial, recreational,
scientific, or educational purposes;
(c) disease or predation;
(d) the inadequacy of existing regulatory mechanisms;
or
(e) other natural or manmade factors affecting the
species’ continued existence.

16 U.S.C §§ 1533(a)(1)(A)-(E); see also 50 C.F.R. § 424.11(c).

The agency must list a species if “any one or a combination” of

these factors demonstrates that the species is threatened or

endangered. 50 C.F.R. § 424.11(c).

3
The Secretary of the Interior has delegated his
responsibilities under the Act to FWS. See 50 C.F.R.
§ 402.01(b). The Secretary of Commerce has delegated his
responsibilities under the Act to the National Marine Fisheries
Service (“NMFS”). See id.

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The ESA further provides that the decision to list a

species must be made

solely on the basis of the best scientific and
commercial data available . . . after conducting a
review of the status of the species and after taking
into account those efforts, if any, being made by any
State or foreign nation, or any political subdivision
of a State or foreign nation, to protect such species
. . . .

16 U.S.C. § 1533(b)(1)(A).

B. Factual and Procedural Background

Polar bears are marine mammals that are described as “ice-

obligate,” meaning that they are evolutionarily adapted to, and

indeed completely reliant upon, sea ice for their survival and

primary habitat. ARL 117259. 4 They depend upon sea ice for

critical functions such as hunting ice-dependent seals (their

primary source of food), migrating between feeding areas and

land-based maternity dens, and traveling long distances in

search of mates or food. ARL 139259. Over most of their range,

polar bears remain on the ice year-round. ARL 139245. The

international Polar Bear Specialist Group – the authoritative

source for information on the world’s polar bears – has

identified nineteen polar bear populations located within five

countries in the ice-covered regions of the Northern Hemisphere:

4
The facts in this background section are excerpted from the
administrative record for the Listing Rule. Citations to the
administrative record for the Listing Rule are abbreviated
“ARL.”

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the United States (in Alaska), Canada, Denmark (in Greenland),

Norway, and Russia. 5 ARL 117216-17, 117219.

On February 16, 2005, the Center for Biological Diversity

submitted a petition to the Secretary of the Interior to list

the polar bear as a threatened species under the ESA due to

observed and anticipated declines in the Arctic sea ice upon

which the polar bear relies for survival. See generally ARL

4040-4209. FWS ultimately issued a final rule listing the polar

bear as a threatened species on May 15, 2008. 6 See generally ARL

5
These nineteen populations are generally identified by
their geographical location: Arctic Basin, Baffin Bay, Barents
Sea, Chukchi Sea, Davis Strait, East Greenland, Foxe Basin, Gulf
of Boothia, Kane Basin, Kara Sea, Lancaster Sound, Laptev Sea,
M’Clintock Channel, Northern Beaufort Sea, Norwegian Bay,
Southern Beaufort Sea, Southern Hudson Bay, Western Hudson Bay,
and Viscount Melville Sound. ARL 117220, Figure 1. The United
States Geological Survey (“USGS”) recently re-evaluated the
existing population boundaries to create an additional
population - Queen Elizabeth – located on the northern border of
Greenland. ARL 117222.
6
Prior to the action currently before this Court, the Center
for Biological Diversity also initiated lawsuits to enforce
various statutory deadlines throughout the listing process for
the polar bear. To the maximum extent practicable, the
Secretary must respond to listing petitions within 90 days with
an initial finding stating whether the petition “presents
substantial scientific or commercial information indicating that
the petitioned action may be warranted.” 16 U.S.C.
§ 1533(b)(3)(A). When the Secretary failed to timely respond to
its listing petition, the Center for Biological Diversity filed
an action in the Northern District of California in December
2005. Ctr. for Biological Diversity v. Norton, No. 05-5191
(N.D. Cal. filed Dec. 15, 2005). The Secretary ultimately
published a 90-day finding on February 9, 2006, ARL 5597-98, and
he agreed to issue the next required finding by December 27,
2006. The parties settled the case with a consent decree to
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117215-117307. At the time of listing, there were estimated to

be approximately 20,000 to 25,000 polar bears worldwide,

distributed throughout the species’ range. 7 ARL 117219. These

estimates further indicated that two of the nineteen polar bear

populations were increasing in numbers (Viscount Melville Sound

and M’Clintock Channel); six populations were stable (Northern

Beaufort Sea, Southern Hudson Bay, Davis Strait, Lancaster

Sound, Gulf of Boothia, Foxe Basin); and five populations were

declining (Southern Beaufort Sea, Norwegian Bay, Western Hudson

Bay, Kane Basin, Baffin Bay). ARL 117221. Insufficient data

were available to identify trends for the remaining six

populations (Barents Sea, Kara Sea, Laptev Sea, Chukchi Sea,

Arctic Basin, East Greenland). ARL 117221.

that effect. See Settlement Agreement, Ctr. for Biological
Diversity v. Kempthorne, No. 05-5191 (N.D. Cal. June 28, 2006).
On January 9, 2007, FWS published in the Federal Register a
proposed rule to list the species as threatened throughout its
range. See generally ARL 59985-60021. The ESA imposes a
nondiscretionary deadline of one year from the date a proposed
rule is published within which the agency must publish a final
rule. 16 U.S.C. § 1533(b)(6). After that one-year deadline
passed, the Center for Biological Diversity filed a second
action to compel FWS to issue its final rule. Ctr. for
Biological Diversity v. Kempthorne, No. 08-1339 (N.D. Cal. filed
Mar. 10, 2008). The Northern District of California granted
plaintiff’s motion for summary judgment and directed FWS to
publish its final listing determination for the polar bear by
May 15, 2008. Ctr. for Biological Diversity v. Kempthorne, No.
08-1339, 2008 U.S. Dist. LEXIS 34753 (N.D. Cal. Apr. 28, 2008).
7
The Service found that the polar bear occupied the full
extent of its historical range at the time of listing. See ARL
117242.

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In its Listing Rule, FWS acknowledged that sea ice

conditions across the Arctic had changed over the past several

decades. ARL 117227-28. Specifically, the agency cited data

indicating that the summer/fall ice melt season in the Arctic

lengthened by approximately two weeks per decade between 1979

and 2005. ARL 117227. The agency also cited data indicating

that September (i.e., minimum) sea ice extent was at an all-time

low during the period between 2002 and 2007. ARL 117224. FWS

further noted that scientists had observed significant recent

declines in winter (i.e., maximum) sea ice extent, ARL 117226,

cumulative annual sea ice extent, ARL 117226, and overall sea

ice age and thickness, ARL 117226-27.

Relying on complex climate models and related data from the

International Panel on Climate Change (“IPCC”) – which FWS

acknowledged to be the leading international body in climate

change science – FWS attributed these changes in sea ice to

increased Arctic temperatures caused by greenhouse gas emissions

and related changes in atmospheric and oceanic circulation. 8 ARL

117227-30. As FWS described, due to a reported lag time in

response between when greenhouse gases are emitted into the

8
In its final Listing Rule, FWS relied in particular on the
IPCC Fourth Assessment Report (“AR4”), issued in 2007, which was
the most recent climate change report available from the IPCC at
the time FWS made its listing determination. ARL 117231; see
generally ARL 151180-152632.

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atmosphere and when the impacts of those emissions are felt on

the ground, the IPCC concluded that the global climate system is

committed to a continued warming trend through the end of the

21st century. ARL 117233-34. Indeed, FWS noted that average

projected warming levels through mid-century were generally

consistent across all IPCC climate models, regardless of

differences in possible emission levels over that period. ARL

117257. FWS looked also to IPCC models of Arctic sea ice, which

similarly projected declines in ice extent through the end of

the 21st century. ARL 117234. As FWS noted, the ten models

that most accurately reflected historical sea ice changes prior

to 2007 all projected a decline in September sea ice extent of

over thirty percent (30%) by mid-century. ARL 117236-37. On

the basis of these IPCC models and associated analysis, FWS

concluded that it could confidently predict a significant

decline in the polar bear’s sea ice habitat over the next 40 to

50 years. ARL 117279-81.

FWS further concluded that the extent of anticipated

declines in sea ice will significantly impact polar bear

population health. ARL 117279. As FWS described, sea ice

losses have been tied to nutritional stress in polar bears

because of lower overall numbers of ice-dependent prey,

decreased access to the prey that remain, shorter hunting

seasons and longer seasonal fasting periods, and higher

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energetic demands from traveling farther and swimming longer

distances across open water to reach sea ice. ARL 117279. FWS

determined that this nutritional stress and other related

factors will likely result in a decline in the physical

condition of polar bears, leading to lower overall body weights

and reduced cub survival rates. ARL 117270. FWS further found

that consistent declines in physical condition and reproductive

success will ultimately lead to population-level declines. ARL

117279.

In reaching this conclusion, FWS relied in part on long-

term studies showing that these impacts had already been

observed in some of the southern-most polar bear populations.

According to FWS, monitoring reports indicated that the Western

Hudson Bay population – one of the longest-studied polar bear

groups – had experienced declines in body condition among both

adult male and adult female bears over the past three decades,

with an associated population decrease of approximately twenty-

two percent (22%). ARL 117271. FWS noted that this Canadian

population also experienced significant declines in body mass

among female bears over that period. ARL 117270. A

comprehensive review of the polar bear’s status conducted prior

to listing indicated that, between 1971 and 2001, the average

date of spring break-up of the sea ice in the region advanced by

three weeks, and temperatures increased by between 0.5ºC and

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0.8ºC per decade. ARL 139286. The correlation between the

timing of sea ice break-up and the body condition of adult

female polar bears was found to be statistically significant.

ARL 139286.

The same polar bear status review also indicated that

scientists monitoring the Southern Beaufort Sea polar bear

population – another long-studied group – observed similar

changes in body condition and unusual hunting behaviors. ARL

139279. As noted in the status review, population estimates for

this group between 1986 and 2006 also showed declines, although

researchers were not confident enough in these estimates to

assert that the observed declines were statistically

significant. ARL 139279.

Prior to issuing its final rule, FWS commissioned the

United States Geological Survey (“USGS”) to conduct additional

scientific analysis related to the polar bear listing decision. 9

Among other things, USGS undertook an effort to forecast the

status of polar bears in different parts of the Arctic at three

future time periods in the 21st century (i.e., 45 years, 75

years, and 100 years). See generally Forecasting the Range-Wide

9
FWS commissioned USGS to prepare this additional analysis
in February 2007, after the publication of the proposed listing
rule to list the polar bear as a threatened species. ARL
117239. In response to the significant new information
contained in the USGS reports, FWS re-opened the public comment
period on the proposed rule through October 22, 2007. ARL
117239.
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Status of Polar Bears at Selected Times in the 21st Century, ARL

161306-161436. USGS developed two models in an effort to

predict potential future changes to polar bear population

numbers across a range of scenarios, using climate models and

the existing body of knowledge about polar bears. ARL 161313.

A simple “carrying capacity” model was designed to estimate

potential changes in numbers of bears based on current polar

bear population densities and annual sea ice projections. ARL

161316. A more comprehensive “Bayesian Network” model was

designed to determine the probability of certain population

outcomes (e.g., “larger than now,” “same as now,” “smaller,”

“rare,” or “extinct”), taking into account a wide range of

factors including the seasonal availability of sea ice, as well

as population stressors unrelated to sea ice loss. ARL 161317,

161325-26.

For the purpose of these models, USGS grouped the nineteen

global polar bear populations into four “ecoregions” – Seasonal

Ice, Divergent Ice, Convergent Ice, and Archipelago – based upon

regional patterns of ice formation. ARL 117276. The Seasonal

Ice Ecoregion, for example, occurs at the southern end of the

polar bear range and is ice-free for a portion of the year. ARL

117221. In the Divergent Ice Ecoregion, which is located mainly

in Alaska, ice formed at the shore drifts away from land as a

result of wind and ocean currents. ARL 117222. In the

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Convergent Ice Ecoregion, sea ice formed in the Divergent Ice

Ecoregion moves toward land and collects at the shore. ARL

117222. The Archipelago Ecoregion, at the northernmost point of

the Canadian Arctic, generally has thicker and more persistent

ice year-round. ARL 117222. USGS determined that these

variations in sea ice conditions generally correlate to

differences in how polar bears interact with their sea ice

habitat. ARL 117221.

Consistent with IPCC climate and sea ice models, both of

the USGS models projected population declines in all four polar

bear ecoregions over the next 100 years. ARL 161312. The

simple carrying capacity model indicated that polar bear

population levels range-wide will have moderately decreased by

year 45, assuming average projected levels of future sea ice.

ARL 161331. Assuming minimal levels of future sea ice, the

carrying capacity model projected trends “toward extirpation” of

bears in the Divergent Ice Ecoregion by year 45 and in the

Seasonal Ecoregion by year 75. ARL 161331. Similarly,

according to USGS, the Bayesian Network model results suggested

that “multiple stressors will likely play important and

deleterious roles on all polar bear populations, even starting

at year 45, and generally increase in their effect through year

100.” ARL 161332. For example, the Bayesian Network model

projected an outcome of extinction for bears in the Seasonal and

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Divergent Ice Ecoregions by year 45 and for bears in the

Convergent Ice Ecoregion by year 75. ARL 161312-13. In the

Archipelago Ecoregion, a “smaller” population was the dominant

outcome at year 45 under all scenarios. ARL 161332.

In relying on the USGS population models, FWS emphasized

that it had less confidence in the specific numerical outcomes

of these models than in their “general direction and magnitude.”

ARL 117278. Specifically, FWS pointed to several caveats that

USGS itself identified in the development of these models. As

FWS described, USGS acknowledged that the carrying capacity

model only accounted for changes in sea ice extent and could not

account for several other important factors, including seasonal

ice fluctuations and other population stressors. ARL 117277.

Further, USGS indicated that this simple model assumed a linear

relationship between sea ice and numbers of bears, which is not

necessarily the case, and it also assumed that polar bear

density will not change over time, which “is almost certainly

not valid.” ARL 161323. FWS similarly discounted the specific

outcomes of the Bayesian Network model, which USGS described as

a “first-generation ‘alpha’ level prototype,” ARL 161338,

because it reflected the judgment of only one polar bear expert

and “still must be vetted through other polar bear experts.”

ARL 161338; see also ARL 117278. Insofar as these population

models were generally consistent with the record as a whole,

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however, FWS found that these models supported a conclusion that

sea ice losses will negatively impact polar bears in a

significant way within the foreseeable future. ARL 117278; ARL

117300.

Based on a voluminous administrative record, including the

studies described above, and input from fourteen peer reviewers

and numerous polar bear specialists, climate scientists, experts

in Traditional Ecological Knowledge (“TEK”), 10 state and federal

agencies, foreign governments, Alaska Native tribes and tribal

organizations, federal commissions, local governments,

commercial and trade organizations, conservation organizations,

nongovernmental organizations, and private citizens, FWS

concluded that the polar bear was threatened throughout its

range at the time of listing, within the meaning of the ESA.

ARL 117296. Specifically, FWS determined that all polar bear

10
TEK is a formally-recognized body of knowledge developed by
the native people who co-exist with the polar bear in its
habitat. TEK principles and observations include where and when
polar bears feed, how they hunt, where they den, how they
respond to different types of ice habitat, and how they travel.
See Defendant-Intervenor Arctic Slope Regional Corporation
Cross-Motion and Memorandum in Opposition, Docket Nos. 146, 147
(“ASRC Def-Int. Mot.”) at 3. This knowledge has been gained
through traditional subsistence efforts, handed down over
generations by oral tradition, and shared with scientists
researching the species, including FWS scientists. ASRC Def-
Int. Mot. at 3. TEK offers an opportunity for “clear
observational records over relatively long temporal scales.”
ASRC Def-Int. Mot. at 11 (quoting ARL 130884). For the purposes
of the Listing Rule, FWS accepted TEK as a relevant source of
information on the ecology of polar bears. ARL 117252.

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populations will be affected by substantial losses of sea ice

within the foreseeable future (which it defined as 45 years),

although different populations will be affected at different

rates and to different degrees. ARL 117279-80. FWS further

found that polar bears are unlikely to adapt to these

anticipated habitat changes. ARL 117264-66.

However, notwithstanding these findings, FWS concluded that

the polar bear was not endangered in any portion of its range at

the time of listing. ARL 117301. The agency determined that at

the time of listing the species was generally abundant

throughout its range, the species continued to occupy the full

extent of its historical range, and it had yet to experience

precipitous population declines in any portion of its range.

ARL 117299-301. Even in the Western Hudson Bay population,

where a statistically-significant decline had been observed, the

species continued to reproduce normally. ARL 117300. According

to FWS, these countervailing facts demonstrated that the polar

bear was not “in danger of extinction” at the time it made its

listing decision, although the agency reiterated that the

species would likely become an endangered species by mid-

century. ARL 117301.

The publication of the Listing Rule triggered lawsuits by a

number of organizations and individuals: (1) the State of Alaska

- 21 -
(“Alaska”) 11 (State of Alaska v. Salazar, et al., No. 08-1352

(D.D.C. Aug. 4, 2008)); (2) Safari Club International and Safari

Club International Foundation (collectively, “SCI”) 12 (Safari

Club Int’l, et al. v. Salazar, et al., No. 08-1550 (D.D.C. Sept.

8, 2008)); (3) California Cattlemen’s Association and the

Congress on Racial Equality (collectively, “CCA”) 13 (California

Cattlemen’s Ass’n, et al. v. Salazar, et al., No. 08-1689

(D.D.C. Oct. 2, 2008)); (4) Center for Biological Diversity,

Natural Resources Defense Council, and Greenpeace (collectively,

“CBD”) 14 (Ctr. for Biological Diversity, et al. v. Salazar, et

11
The State of Alaska is a sovereign state with an averred
interest in the management of its wildlife and natural
resources, including the polar bear, and an averred interest in
the impact of the Listing Rule on public services, tourism,
transportation, and resource development within the state.
Alaska Compl. ¶¶ 9, 10.
12
Safari Club International and Safari Club International
Foundation are not-for-profit public education and hunting
advocacy organizations with an averred interest in the impact of
the Listing Rule on sustainable use wildlife conservation
efforts, including foreign trophy hunting programs. SCI Compl.
¶¶ 14-17.
13
California Cattlemen’s Association and the Congress on
Racial Equality are not-for-profit organizations that represent
California’s beef producers and poor and minority business
owners, respectively, with an averred interest in ensuring that
the Listing Rule does not expose their members to an elevated
risk of citizen suits and increased costs of doing business.
CCA First Am. Compl. ¶¶ 5, 6.
14
Center for Biological Diversity, Natural Resources Defense
Council, and Greenpeace are not-for-profit environmental
advocacy organizations with members that have an averred
interest in the protection and conservation of wildlife species,
- 22 -
al., No. 08-1339 (N.D. Cal. Mar. 10, 2008)); 15 and

(5) Conservation Force, the Inuvialuit Game Council, and

numerous hunting and trapping organizations as well as

individuals (collectively, “CF”) 16 (Conservation Force, et al. v.

Salazar, et al., No. 09-245 (D.D.C. Feb. 9, 2009)). These five

actions were subsequently consolidated before this Court, along

with six related actions, pursuant to an order of the Judicial

Panel on Multi-District Litigation. 17 See generally Certified

Copy of Transfer Order, Docket No. 1. 18

such as the polar bear, and their habitat. CBD Third Am. Compl.
¶¶ 20-23.
15
This case was subsequently transferred and assigned a new
case number in this Court. See Ctr. for Biological Diversity,
et al. v. Salazar, et al., No. 08-2113 (D.D.C. Dec. 8, 2008).
16
Conservation Force is a not-for-profit wildlife
conservation organization with an averred interest in managing
and protecting game species, including polar bears. CF Compl.
¶ 16. Joining with Conservation Force in its lawsuit is the
Inuvialuit Game Council, which represents the interests of the
Inuvialuit people on all matters pertaining to wildlife
management within Canada’s Inuvialuit Settlement Region. CF
Compl. ¶ 17. Also joining with these plaintiffs are a number of
hunting and trapping organizations, sportsmen organizations and
outfitters, and individuals who have participated in polar bear
trophy hunting. CF Compl. ¶¶ 18-50.
17
On the same day that FWS issued its final rule listing the
polar bear as a threatened species, the Secretary of the
Interior published proposed regulations pursuant to 16 U.S.C.
§ 1533(d). See Special Rule for the Polar Bear, 73 Fed. Reg.
28,306 (May 15, 2008) (“Interim 4(d) Rule”). These regulations
were later finalized and codified at 50 C.F.R. § 17.40(q) and
are the subject of two additional actions before this Court.
The four remaining actions challenge the Service’s subsequent
refusal to issue permits for importing sport-hunted polar bear
- 23 -
Several groups intervened to defend against plaintiffs’

challenges to the Listing Rule. Specifically, this Court

permitted the Alaska Oil and Gas Association (“AOGA”) and the

Arctic Slope Regional Corporation (“ASRC”) to intervene as

defendants in the challenge brought by plaintiff CBD. See

Stipulation and Order Regarding Intervention, Docket No. 33, at

4-5. The Court also permitted SCI, a plaintiff in its own

action, to intervene as a defendant in the action brought by

plaintiff CBD. Plaintiff CBD was permitted to intervene as a

defendant in the remaining challenges to the Listing Rule.

On October 20, 2009, plaintiffs filed their motions for

summary judgment. 19 Among other claims, plaintiff CBD contends

trophies under the Marine Mammal Protection Act (“MMPA”), 16
U.S.C. §§ 1371-1389 (2006). These six actions have been briefed
separately from the Listing Rule cases; therefore, the Court
does not address either the 4(d) Rule or the import ban
challenges here.
18
Unless otherwise specified, all references to pleadings,
proceedings, hearings, opinions, and orders can be found on the
Misc No. 08-764 docket.
19
Plaintiffs Center for Biological Diversity, Natural
Resources Defense Council and Greenpeace jointly filed a motion
for summary judgment. See generally Motion for Summary Judgment
by CBD, Docket No. 125 (“CBD Mot.”). The remaining plaintiffs
also filed a joint motion for summary judgment that addresses
their common claims. See generally Joint Motion for Summary
Judgment on Listing Rule Claims, Docket No. 127 (“JP Mot.”).
The Court also permitted each of these plaintiffs to submit
supplemental motions and memoranda in support of summary
judgment. See generally Alaska’s Motion for Summary Judgment on
Listing Rule Claims, Docket No. 128 (“Alaska Mot.”); Motion and
Supplemental Memorandum of CCA in Support of Motion for Summary
- 24 -
that the decision to list the polar bear as threatened was

arbitrary and capricious because the polar bear met the

definition of an endangered species under the ESA at the time of

listing and thus qualified for a higher level of protection.

The remaining plaintiffs (collectively, “Joint Plaintiffs”)

contend, among other things, that the decision to list the polar

bear was arbitrary and capricious because the polar bear did not

meet the definition of a threatened species at the time of

listing and therefore did not qualify for ESA protections.

The federal defendants filed their cross-motion for summary

judgment on December 7, 2009. See generally Federal Defendants’

Combined Opposition and Cross-Motion for Summary Judgment on

Listing Rule Claims, Docket No. 137 (“Fed. Def. Mot.”). The

various defendant-intervenors filed their cross-motions for

summary judgment on January 19, 2010. 20

Judgment Challenging the Listing Rule, Docket No. 124 (“CCA
Mot.”); Motion for Summary Judgment and Supplemental Memorandum
of Points and Authorities by SCI, Docket No. 123 (“SCI Mot.”);
Motion for Summary Judgment by CF, Docket No. 126, corrected at
Docket No. 131 (“CF Mot.”).
20
See generally Defendant-Intervenor SCI Cross-Motion for
Summary Judgment and Memorandum in Opposition, Docket Nos. 144,
145 (“SCI Def-Int. Mot.”); Defendant-Intervenor ASRC Cross-
Motion and Memorandum in Opposition, Docket Nos. 146, 147 (“ASRC
Def-Int. Mot.”); Defendant-Intervenor AOGA Cross-Motion for
Summary Judgment, Docket No. 148 (“AOGA Def-Int. Mot.”);
Defendant-Intervenor CBD Cross-Motion for Summary Judgment,
Docket No. 149 (“CBD Def-Int. Mot.”).
- 25 -
This Court held an initial hearing on the parties’ cross-

motions for summary judgment on October 20, 2010. At that

hearing, the Court focused only on a threshold question: whether

it must review the agency’s interpretation of the ESA listing

classifications under step one or step two of the familiar

framework set forth in Chevron, U.S.A., Inc. v. Natural

Resources Defense Council, Inc., 467 U.S. 837 (1984). In a

Memorandum Opinion issued on November 4, 2010, the Court held

that FWS had improperly relied on an erroneous plain-meaning

reading of the definition of an endangered species that could

not be upheld under step one of Chevron. In re Polar Bear

Endangered Species Act Listing and § 4(d) Rule Litigation, 748

F. Supp. 2d 19, 29 (D.D.C. 2010) [hereinafter In re Polar Bear].

Finding that the term “endangered species” under the ESA is

instead ambiguous, the Court remanded the Listing Rule to the

agency “to treat the statutory language as ambiguous.” Id.

In response to the Court’s remand order, on December 22,

2010, the federal defendants submitted the agency’s memorandum

of supplemental explanation. See generally Supplemental

Explanation for the Legal Basis of the Department’s May 15, 2008

Determination of Threatened Status for Polar Bears, Docket No.

237-1 (“Supp. Exp.”). In their Supplemental Explanation, FWS

concluded that, even treating the phrase “in danger of

extinction” in the definition of an endangered species as

- 26 -
ambiguous, the administrative record does not support a finding

that the polar bear qualified for endangered status at the time

of listing. Because the agency determined that the species is

likely to become endangered within the foreseeable future,

however, FWS reiterated that the polar bear met ESA’s the

definition of a threatened species at the time of listing.

Supp. Exp. at 16.

The Court gave the parties an opportunity to submit

additional briefs responding to the agency’s supplemental

explanation. See generally Joint Plaintiffs’ Response to

Federal Defendants’ Supplemental Explanation, Docket No. 240

(“JP Supp. Mem.”); Plaintiff CBD’s Response to Federal

Defendants’ Supplemental Explanation, Docket No. 241 (“CBD Supp.

Mem.”); AOGA and ASRC Defendant-Intervenors’ Response to Federal

Defendants’ Supplemental Explanation, Docket No. 239 (“AOGA

Supp. Mem.”); Federal Defendants’ Supplemental Reply, Docket No.

242 (“Fed. Def. Supp. Reply”). A second motions hearing was

held on February 23, 2011, during which the Court heard

arguments on all plaintiffs’ Listing Rule claims. The parties’

cross-motions for summary judgment are now ripe for

determination by the Court.

II. STANDARD OF REVIEW

The Service’s listing decisions are subject to review under

the APA. See, e.g., Am. Wildlands v. Kempthorne, 530 F.3d 991,

- 27 -
997 (D.C. Cir. 2008). Under APA review, federal agency actions

are to be held unlawful and set aside where they are “arbitrary,

capricious, an abuse of discretion, or otherwise not in

accordance with law.” 5 U.S.C. § 706(2)(A). To make this

finding, a court must determine whether the agency “considered

the factors relevant to its decision and articulated a rational

connection between the facts found and the choice made.”

Keating v. FERC, 569 F.3d 427, 433 (D.C. Cir. 2009) (citing

Balt. Gas & Elec. Co. v. Natural Res. Def. Council, Inc., 462

U.S. 87, 105 (1983)).

The standard of review under the APA is a narrow one.

Citizens to Pres. Overton Park v. Volpe, 401 U.S. 402, 416

(1971). The court is not empowered to substitute its judgment

for that of the agency. Id. Deference to the agency’s judgment

is particularly appropriate where the decision at issue

“requires a high level of technical expertise.” Marsh v. Or.

Natural Res. Council, 490 U.S. 360, 375-77 (1989); Ethyl Corp.

v. EPA, 541 F.2d 1, 36 (D.C. Cir. 1976) (“[The court] must look

at the decision not as the chemist, biologist or statistician

that [it is] qualified neither by training nor experience to be,

but as a reviewing court exercising [its] narrowly defined duty

of holding agencies to certain minimal standards of

rationality.”). Specifically, with regard to FWS decisions,

this Court has previously recognized that “[g]iven the expertise

- 28 -
of the FWS in the area of wildlife conservation and management

and the deferential standard of review, the Court begins with a

strong presumption in favor of upholding decisions of the

[FWS].” Am. Wildlands v. Kempthorne, 478 F. Supp. 2d 92, 96

(D.D.C. 2007) (citing Carlton v. Babbitt, 900 F. Supp. 526, 530

(D.D.C. 1995)).

This narrow, deferential standard does not, however, shield

the agency from a “thorough, probing, in-depth” review. Overton

Park, 401 U.S. at 415. The court’s inquiry into the facts must

be both “searching and careful.” Id. at 416. Administrative

action must be invalidated as arbitrary where the agency

relied on factors which Congress has not intended it
to consider, entirely failed to consider an important
aspect of the problem, offered an explanation for its
decision that runs counter to the evidence before the
agency, or is so implausible that it could not be
ascribed to a difference in view or the product of
agency expertise.

Motor Vehicle Mfrs. Ass’n v. State Farm Mut. Auto Ins. Co., 463

U.S. 29, 43 (1983). This determination must be made solely on

the basis of the record before the agency when it made its

decision. Camp v. Pitts, 411 U.S. 138, 142 (1973).

Where the court reviews an agency’s interpretation of a

statute it is charged with administering, the Supreme Court’s

opinion in Chevron provides the appropriate framework of review.

The first step in this review process is for the court to

determine “whether Congress has directly spoken to the precise

- 29 -
question at issue.” Chevron, 467 U.S. at 842. “If the intent

of Congress is clear, that is the end of the matter; for the

court, as well as the agency, must give effect to the

unambiguously expressed intent of Congress.” Id. at 842-43. In

determining whether the statute unambiguously expresses the

intent of Congress, the court should use all the “traditional

tools of statutory construction,” see id. at 843 n.9, including

looking to the text and structure of the statute, as well as its

legislative history, if appropriate. See Bell Atlantic Tel. Co.

v. FCC, 131 F.3d 1044, 1047 (D.C. Cir. 1997).

If the court concludes that the statute is either silent or

ambiguous with respect to the precise question at issue, the

second step of the court’s review process is to determine

whether the interpretation proffered by the agency is “based on

a permissible construction of the statute.” Chevron, 467 U.S.

at 843. The court must defer to agency interpretations that are

not “procedurally defective, arbitrary or capricious in

substance, or manifestly contrary to the statute.” United

States v. Mead, 533 U.S. 218, 227 (2001) (citing Chevron, 467

U.S. at 843-44).

III. DISCUSSION

Plaintiffs have identified a number of purported

deficiencies in the Listing Rule, each of which forms the basis

for a claim that FWS violated both the ESA and the APA when it

- 30 -
listed the polar bear as a threatened species. Plaintiffs’

claims can be classified into three general categories.

First, each of the plaintiffs in this case argues that the

Service’s decision to list the polar bear as a threatened

species was based on a fundamentally flawed interpretation of

the ESA’s listing standards and a misguided application of the

record evidence. Specifically, plaintiff CBD claims that FWS

wrongly concluded that the polar bear did not qualify for

endangered status at the time of listing, given the evidence in

the record indicating that substantial anticipated sea ice

losses will continue through the end of the 21st century. By

contrast, Joint Plaintiffs claim that FWS failed to demonstrate

that the polar bear is sufficiently likely to become endangered

within the foreseeable future and, therefore, the agency wrongly

concluded that the polar bear qualified for threatened status at

the time of listing. In the alternative, a smaller subset of

plaintiffs (including CBD, SCI, and CF) argues that FWS erred

when it concluded that no polar bear population or ecoregion

qualifies as a “distinct population segment,” which would have

allowed the Service to tailor ESA protections more narrowly

across populations.

Second, plaintiffs argue that FWS ignored or otherwise

failed to adequately address four listing factors that the ESA

requires the agency to consider. Joint Plaintiffs claim that

- 31 -
the Service failed to adequately “take into account” foreign

conservation programs, particularly Canadian sport-hunting

programs, because it failed to ensure that its listing decision

would not negatively impact those programs. Joint Plaintiffs

also claim that the Service failed to demonstrate that it relied

upon the “best available science,” because the climate models,

population models, and population monitoring studies the Service

relied upon do not, in fact, support the agency’s conclusion

that the polar bear is likely to become endangered within the

foreseeable future. Plaintiff CBD claims that FWS improperly

downplayed the threat of hunting to the polar bear and wrongly

concluded that the polar bear was not in danger of extinction at

the time of listing as a result of the combined threats of

habitat loss (“Listing Factor A”) and overutilization (“Listing

Factor B”). Joint Plaintiffs finally claim that FWS wrongly

concluded that existing regulatory mechanisms (“Listing Factor

D”) will be insufficient to protect the polar bear despite

future sea ice losses.

Third and finally, plaintiffs identify deficiencies in the

Service’s decision-making process for the Listing Rule.

Plaintiff Alaska claims that FWS failed to provide an adequate

“written justification” in response to the State’s comments, as

it was required to do under Section 4(i) of the ESA. Plaintiff

- 32 -
CF claims that FWS similarly erred by failing to respond to its

comments on the Listing Rule.

Having carefully considered each of these arguments, the

Court is simply not persuaded that the Service’s decision to

list the polar bear as a threatened species under the ESA was

arbitrary and capricious. As the Supreme Court noted in Babbitt

v. Sweet Home, “[t]he task of defining and listing endangered

and threatened species requires an expertise and attention to

detail that exceeds the normal province of Congress,” and of the

courts as well. 515 U.S. 687, 708 (1995). This Court is not

empowered to substitute its own judgment for that of the agency

but can only hold the agency to “minimal standards of

rationality.” Ethyl Corp., 541 F.2d at 36. Accordingly, and

for the reasons set forth below, the Court finds that the

Listing Rule represents a reasoned exercise of the Service’s

discretion based on the facts and the best available science at

the time the agency made its determination.

The Court will now address each of plaintiffs’ claims in

turn. 21

21
As a threshold matter, the federal defendants contend that
one set of plaintiffs – California Cattlemen’s Association and
the Congress on Racial Equality – failed to demonstrate standing
to challenge the Listing Rule and, therefore, any claims
uniquely raised by those plaintiffs must be dismissed. The
Court finds, however, that these plaintiffs have raised no
claims that were not also fully briefed by the larger group of
Joint Plaintiffs. Accordingly, as the federal defendants
- 33 -
A. The Service Articulated a Rational Basis for Its
Conclusion that the Polar Bear Met the Definition of a
Threatened Species at the Time of Listing

1. Plaintiff CBD’s Claim that the Polar Bear Should
Have Been Considered Endangered at the Time of
Listing

The Court turns first to plaintiff CBD’s claim that FWS

wrongly concluded that the polar bear did not qualify for

endangered status as of 2008. The Court will begin by outlining

the Service’s interpretation of the definition of an endangered

species under the ESA, as applied to the polar bear.

a. The Service’s Findings

In their original briefs and at a motions hearing held on

October 20, 2010, the federal defendants argued that the text,

structure, and legislative history of the ESA plainly and

unambiguously require that a species must be in imminent danger

of extinction to be designated as an endangered species. This

Court held in a November 4, 2010 Memorandum Opinion that neither

concede that the remaining plaintiffs in this action have
demonstrated their standing to challenge the Listing Rule, see
Fed. Def. Reply, Docket No. 195, at 71-72, the Court need not
consider the federal defendants’ standing challenge, and it
declines to do so. See Massachusetts v. EPA, 549 U.S. 497, 518
(2007) (“Only one of the petitioners needs to have standing to
permit us to consider the petition for review.”); see also Ass’n
of Am. Physicians and Surgeons, Inc. v. FDA, 539 F. Supp. 2d 4,
14 (D.C. Cir. 2008) (citing Mountain States Legal Found. v.
Glickman, 92 F.3d 1228, 1232 (D.C. Cir. 1996) (“‘For each claim,
if constitutional and prudential standing can be shown for at
least one plaintiff, [the court] need not consider the standing
of the other plaintiffs to raise that claim.’”)).

- 34 -
the statute itself nor its legislative history compels the

federal defendants’ reading of the term “in danger of

extinction” and that the term is, instead, ambiguous. In re

Polar Bear, 748 F. Supp. 2d at 28-29. Accordingly, following

D.C. Circuit precedent, the Court remanded the rule to agency

decision-makers to “fill in the gap” in the statute by providing

additional explanation for the agency’s determination that the

polar bear was not in danger of extinction at the time of

listing. Id. at 29. On December 22, 2010, the federal

defendants submitted the agency’s Supplemental Explanation in

response to the Court’s remand order.

The Service emphasizes that its Supplemental Explanation is

not intended to set forth a new statement of agency policy or a

new “rule” pursuant to the APA, nor does the agency intend to

adopt independent, broad-based criteria for defining the

statutory term “in danger of extinction.” Supp. Exp. at 1-2.

Nonetheless, the agency claims that its starting point in making

such a determination is the general understanding that the

phrase “in danger of extinction” describes a species that is

currently on the brink of extinction in the wild. Supp. Exp. at

3. According to FWS, to be “currently on the brink of

extinction” does not necessarily mean that extinction is certain

or inevitable; rather, whether a species is currently on the

brink of extinction “depends on the life history and ecology of

- 35 -
the species, the nature of the threats, and the species’

response to those threats.” Supp. Exp. at 3.

As FWS describes, the agency’s past “endangered” listings

can be broken out into roughly four categories:

Category 1: Species facing a catastrophic threat from
which the risk of extinction is imminent and certain.
In this category, the timing of the threat alone is
sufficient to deem the species in danger of
extinction. The snail darter is the classic example
of a species in this category. See Tenn. Valley Auth.
v. Hill, 427 U.S. 153 (1978). This fish species was
discovered shortly after the Tennessee Valley
Authority had begun construction of the Tellico Dam on
the Little Tennessee River and, at the time of
listing, the dam project threatened to immediately and
completely obliterate the only known population.

Category 2: Narrowly restricted endemics that, as a
result of their limited range or population size, are
vulnerable to extinction from elevated threats. This
category applies to species found in an extremely
limited range that, in addition, are facing increasing
threats. A large portion of listed species fall in
this category. An example of one of these species is
the Devil’s Hole pupfish, which lives in a single
sinkhole in the southern Nevada desert that is
experiencing a drop in groundwater level. See
Cappaert v. United States, 426 U.S. 128 (1976).

Category 3: Species formerly more widespread that have
been reduced to critically low numbers or restricted
ranges and, consequently, are at a high risk of
extinction due to threats that would not otherwise
imperil the species. This category represents a class
of species experiencing both a severe range reduction
and/or precipitous population crash combined with
ongoing threats. Some examples of species falling in
this category include California condors, whooping
cranes, and vernal pool species, many of which have
been all but wiped out by development and related
factors. These species experience such a restricted
range that they are extremely vulnerable to both
ongoing and chance threats.

- 36 -
Category 4: Species with relatively widespread
distribution that have nevertheless suffered ongoing
major reductions in numbers, range, or both, as a
result of persistent threats. This category shares
common characteristics with threatened species in that
they have suffered some recent decline in numbers,
range, or both, but to a more severe extent. An
example of a species falling in this category is the
red-cockaded woodpecker, which was formerly a common
bird but experienced a precipitous decline in 1970
caused by an almost complete loss of its primary
longleaf pine habitat. Currently, only small,
isolated populations of this species remain, making
the species more vulnerable to threats including
reproductive isolation.

Supp. Exp. at 4-6. Although there is no single metric for

determining if a species is “in danger of extinction,” FWS

contends that these four categories demonstrate the agency’s

largely consistent approach to endangered species listings. See

Supp. Exp. at 4.

The Service asserts that its general understanding of the

statutory definition of an “endangered species” and its approach

to species listings is supported by the text, structure, and the

legislative history of the ESA. The Service notes that, insofar

as an endangered species is any species which “is in danger of

extinction” and a threatened species is any species which is

“likely to become an endangered species within the foreseeable

future,” the ESA recognizes species with “two distinct degrees

of imperilment based on the temporal proximity of the risk of

extinction.” Supp. Exp. at 9. Within that general framework,

- 37 -
the agency must exercise its discretion and expert judgment to

weigh multiple factors on a species-specific basis. The Service

asserts that its past listing decisions, including the polar

bear Listing Rule, represent a reasoned exercise of that

discretion. 22

The Service contends that its species-specific listing

determination for the polar bear constitutes a permissible

construction of the ESA, given the life history and ecology of

the species, the nature and timing of the threats, and the

species’ observed and anticipated responses to those threats.

According to FWS, the administrative record in this case

demonstrates that, at the time of listing, the polar bear fit

none of the four general categories of endangered species

identified by the agency as representative of its past listing

decisions. Rather, the evidence before the agency showed that

at the time of listing the polar bear was a widespread,

circumpolar species that had not been restricted to a critically

22
As this Court observed in its November 4, 2010 opinion, the
courts have not offered an interpretation of the phrase “in
danger of extinction” in the context of reviewing a listing
determination. In re Polar Bear, 748 F. Supp. 2d at 26 n.12.
Nonetheless, FWS asserts that its approach is consistent with
judicial interpretations indicating that Congress intended to
delegate broad responsibility to the agency to make listing
determinations. See, e.g., Trout Unlimited v. Lohn, 559 F.3d
946, 961 (9th Cir. 2009) (in which the court found that “[b]y
leaving an ‘explicit gap’ for agency-promulgated regulations,
the ESA expressly delegates authority to the [agency] to decide
how such listing determination should be made.”).
- 38 -
small range or critically low numbers, nor had it suffered

precipitous reductions in numbers or range. See Supp. Exp. at

15.

Specifically, FWS found the following facts dispositive:

• At the time of listing, the polar bear was widely
distributed in nineteen populations and numbered in
abundance between 20,000 to 25,000 individuals. Supp.
Exp. at 15.

• Fourteen of the nineteen polar bear populations were
considered to be stable, increasing, or data deficient at
the time of listing. Supp. Exp. at 15.

• Only one population - Western Hudson Bay - was verified
to be in a statistically-significant decline, although
two other populations were also actually or potentially
declining. Supp. Exp. at 15.

• No population decline was found to be precipitous, and
reproduction and recruitment were still occurring in
declining populations. Supp. Exp. at 15.

In short, FWS determined, “there is simply no information

in the Administrative Record to suggest that the species has

experienced significant population declines or severe

retractions in its range such that it is currently on the brink

of extinction or that it faced a sudden and calamitous threat.”

Supp. Exp. at 15-16. 23 Accordingly, the agency concluded that

23
Although population modeling for the species projected
significant future declines in some polar bear populations, the
agency ultimately determined that these model outcomes were too
uncertain to support a specific conclusion about the actual rate
of decline. See Supp. Exp. at 17. Similarly, although
population monitoring showed evidence of significant declines in
body condition in some polar bear populations, see Supp. Exp. at
- 39 -
the polar bear warranted listing as threatened range-wide but

did not qualify as an endangered species at the time of listing.

b. Plaintiff CBD’s Arguments

Plaintiff CBD contends that, despite this Court’s remand

order, the agency’s interpretation of the term “endangered

species” to exclude the polar bear continues to violate the ESA.

First, CBD contends that the agency has not significantly

departed from its original position that an endangered species

must be at risk of both imminent and certain extinction.

According to CBD, nothing in the text, structure, or legislative

history of the ESA supports the Service’s conclusion that the

temporal proximity of an extinction threat is the controlling

distinction between a threatened and an endangered species. 24

Such a narrow reading of the statute, CBD contends, sets the bar

for an “endangered” listing impossibly high. Moreover, it

contravenes the purpose of the ESA, which is to provide a

flexible approach to protecting species so that they can be

recovered and delisted.

17, FWS found them insufficient to warrant endangered status for
any particular population at the time of listing. See Supp.
Exp. at 18.
24
As this Court noted in its remand order, the legislative
history of the ESA indicates that Congress did not seek to make
any single factor controlling when drawing the distinction
between an endangered and a threatened species, nor did it seek
to limit the applicability of the endangered category to only
those species facing imminent extinction. See In re Polar Bear,
748 F. Supp. 2d at 28.
- 40 -
CBD also claims that the Service unlawfully discounted or

otherwise failed to consider key scientific information in

determining that the polar bear was not endangered in any

portion of its range. Indeed, CBD claims that FWS never

actually analyzed whether, at the time of listing, polar bears

fit within any of the four categories of endangered species

described in its Supplemental Explanation. According to CBD,

the administrative record demonstrates that the polar bear fits

within three of the four “endangered” classifications identified

by the agency.

With respect to Category One, CBD asserts that FWS never

considered whether global warming constitutes a “catastrophic

threat.” CBD contends, as it did in its original briefing, that

polar bears in at least the Seasonal and Divergent Ice

Ecoregions face such a threat, and did at the time of listing,

because the best available science at the time indicated that a

certain amount of warming is already committed through the end

of the 21st century and that continued warming trends are

unlikely to be reversed in the near future. CBD points

specifically to the USGS population modeling exercises, which

projected declines in all of the polar bear ecoregions through

mid-century, or approximately over a 45-year period. CBD also

cites to evidence in the record, including the Listing Rule

itself, which suggests that these models are only conservative

- 41 -
estimates of the potential impacts to polar bears from sea ice

losses. See ARL 117275 (“Simulated and projected rates of

habitat loss during the late 20th and early 21st centuries by

many [climate models] tend to be less than observed rates of

loss during the past two decades; therefore, habitat losses

based on [these models] were considered to be conservative.”);

ARL 117280 (“The record low sea ice conditions of 2007 are an

extension of an accelerating trend of minimum sea ice conditions

and further support the concern that current sea ice models may

be conservative and underestimate the rate and level of change

expected in the future.”).

In addition to the USGS population monitoring exercises,

CBD references population-specific studies to suggest that three

populations – Western Hudson Bay, Southern Beaufort Sea, and

Baffin Bay – were in danger of extinction at the time of

listing. Reports in the record from the international Polar

Bear Specialist Group indicate that six of the nineteen polar

bear populations were declining at the time of listing,

including these three. The Western Hudson Bay population saw a

decline of twenty-two percent (22%) over an eighteen year period

and showed statistically significant declines in body mass among

female bears, ARL 117271, which must maintain a certain body

weight to successfully reproduce, ARL 117270. Researchers

estimated that cub production in this population would “probably

- 42 -
be negligible within the next 15-25 years.” ARL 117270.

Population numbers also declined in the Southern Beaufort Sea

population, along with significant cumulative declines in

observed cub survival and skull size and adult male body mass

and skull size. See ARL 117272. Unprecedented instances of

starvation and cannibalism among the Southern Beaufort Sea were

also reported and attributed to nutritional stress. See ARL

117272.

Finally, CBD points to a letter from the Marine Mammal

Commission (“MMC”), 25 the agency charged with advising FWS on

marine mammal issues, which urged FWS to list the polar bear as

endangered in light of the USGS population modeling reports.

See ARL 126312. In its letter, MMC concluded that “[w]hen taken

as a whole, [the USGS reports] present a bleak picture of the

25
MMC is a non-executive agency created by the Marine Mammal
Protection Act (“MMPA”). 16 U.S.C. §§ 1403, 1406. The MMPA
does not require FWS to follow the MMC’s recommendations but
only requires FWS to respond to MMC and explain its reasoning if
those recommendations are not followed. Id. § 1402(d); see also
ARL 108484. The Court notes that MMC provided two sets of
comments on the listing decision and comments as a peer reviewer
on the Service’s earlier status assessment for the polar bear.
MMC’s comments on the status assessment and its first set of
comments on the proposed listing supported the Service’s range-
wide “threatened” designation for the polar bear. See ARL
18533; ARL 61800; ARL 126309. In its second set of comments,
referenced here, MMC recommended listing the polar bear as
endangered because of USGS population projections for the
Seasonal and Divergent Ice ecoregions. See ARL 126309. FWS
responded to MMC’s recommendation by letter dated June 17, 2008.
AR4D 14233 (final response dated June 17, 2008 included in the
administrative record for the Interim 4(d) Rule); see also ARL
108485 (draft response dated Feb. 28, 2008).
- 43 -
survival prospects of most populations of polar bears, absent

rigorous management of the underlying factors driving climate

change.” ARL 126315. According to CBD, this letter supports a

conclusion that the agency acted arbitrarily in failing to find

that the polar bear was endangered throughout a significant

portion of its range at the time the agency made its decision.

With respect to Category Two, CBD asserts that FWS never

considered whether the polar bear should be considered a

“narrowly restricted endemic” species facing elevated threats.

By contrast, CBD contends that the polar bear should be

considered an endemic species because it relies exclusively on a

particular type of sea ice habitat. FWS acknowledged that this

habitat type is at risk from continued warming patterns; indeed,

this conclusion forms the basis for the agency’s decision to

list the species as threatened. As such, CBD argues that the

agency was obligated to consider whether the polar bear should

have properly been classified as endangered because of its

unique habitat needs and the particular threats to that habitat

from climate change.

Finally, with respect to Category Four, CBD asserts that

the agency failed to consider whether any polar bear population

“‘suffered ongoing major reductions in its numbers, range, or

both, as a result of factors that have not been abated.’” CBD

Supp. Mem. at 24 (quoting Supp. Exp. at 6). At the least, CBD

- 44 -
contends that a twenty-two percent decline in the Western Hudson

Bay population should have been considered a “major decline in

numbers.” CBD Supp. Mem. at 24.

CBD also points out that, although the polar bear was the

first species to be listed due to climate change, FWS never

considered whether the existence of a new threat might warrant

the creation of an altogether new category. Instead, CBD

contends, the agency relied on flawed conclusions, incorrect

assumptions, and an unreasonably narrow interpretation of the

statute to justify a lower level of protection for the polar

bear than the species demands. According to CBD, the agency

consistently failed to articulate a rational connection between

the record evidence and the choice it made. For these reasons,

CBD argues that the Service’s interpretation of the definition

of “endangered species” to exclude the polar bear was arbitrary,

capricious, and manifestly contrary to the text, structure, and

purpose of the ESA.

c. The Court’s Analysis

As a threshold matter, the parties disagree on whether the

Court is obliged to review the statutory interpretation set

forth in the agency’s Supplemental Explanation under the

deferential Chevron framework, or whether another standard

should guide the Court’s review on remand. Before reaching the

merits of the agency’s Supplemental Explanation, the Court must

- 45 -
first determine the appropriate standard of review. The Court

turns now to that question.

i. Standard of Review on Remand

As noted above, where a court reviews an agency’s

interpretation of a statute it is charged with administering,

such as the ESA, the Supreme Court’s opinion in Chevron, U.S.A.,

Inc. v. Natural Resources Defense Council, Inc. provides the

appropriate framework of review. Here, the federal defendants,

the defendant-intervenors, and the Joint Plaintiffs concur that

this Court, having found that the agency’s plain-meaning

interpretation of the definition of an endangered species fails

under step one of the Chevron framework, should now analyze the

agency’s Supplemental Explanation under step two of Chevron,

which requires the Court to uphold any reasonable agency

interpretation of ambiguous statutory language. See 467 U.S. at

843-44. Plaintiff CBD contends, by contrast, that the agency’s

Supplemental Explanation here is not “Chevron step two-worthy.”

CBD Supp. Mem. at 4.

Under the Supreme Court’s decision in United States v.

Mead, an agency interpretation qualifies for Chevron review when

it meets two requirements: (1) “when it appears that Congress

delegated authority to the agency generally to make rules

carrying the force of law,” and (2) “the agency interpretation

claiming deference was promulgated in the exercise of that

- 46 -
authority.” 533 U.S. at 226-27; see also Pub. Citizen, Inc. v.

HHS, 332 F. 3d 654, 659 (D.C. Cir. 2003) (citing Mead standard).

According to CBD, the agency’s Supplemental Explanation meets

neither of these requirements. Indeed, CBD goes further,

arguing that the agency’s Supplemental Explanation is entitled

to no deference at all. Where a Chevron analysis is

inappropriate, the Supreme Court has held that an agency

interpretation may nonetheless be entitled to “respect,” but

only to the extent that interpretation has the “power to

persuade.” Skidmore v. Swift & Co., 323 U.S. 134, 140 (1944);

see also Power v. Barnhart, 292 F.3d 781, 786 (D.C. Cir. 2002)

(“Under Skidmore, we grant an agency’s interpretation only so

much deference as its persuasiveness warrants.”). CBD asserts

that the agency’s Supplemental Explanation has no “power to

persuade” because it is inconsistent with the statute’s text,

legislative history, and policy objectives, and because it is

effectively post hoc rationalization, developed directly in

response to litigation. Accordingly, CBD concludes, the

agency’s interpretation of the statutory phrase “in danger of

extinction” does not warrant deference under either the Chevron

or the Skidmore standard, and this Court “must decide for itself

the best interpretation of ‘in danger of extinction’ as applied

to the polar bear.” CBD Supp. Mem. at 9 (citing Landmark Legal

Found. v. IRS, 267 F.3d 1132, 1136 (D.C. Cir. 2001)).

- 47 -
After careful consideration of these arguments, the Court

nevertheless concludes that Chevron provides the appropriate

standard of review on remand. This Court remanded the Listing

Rule to FWS for the very limited purpose of providing additional

explanation for its listing determination for the polar bear.

In other cases remanding an agency decision for a similarly

limited purpose, the D.C. Circuit has subsequently reviewed the

agency’s supplemental analysis under the Chevron framework. See

Sec’y of Labor v. Nat’l Cement Co. of Cal., 573 F.3d 788, 793

(D.C. Cir. 2009) (concluding that “the Secretary’s

interpretation [on remand] is entitled to Chevron deference”);

PDK Labs., Inc. v. DEA, 438 F.3d 1184, 1189-90 (D.C. Cir. 2006)

(“This leaves us with the task of resolving at Chevron’s second

step whether the Deputy Administrator’s resolution of that

ambiguity [on remand] is based on a permissible construction of

the statute.”).

Indeed, the D.C. Circuit recently addressed this precise

question in Menkes v. U.S. Department of Homeland Security, 637

F.3d 319 (D.C. Cir. 2011). In Menkes, as here, the D.C. Circuit

remanded to the Coast Guard for a “forthright” agency

interpretation of ambiguous statutory language in the Great

Lakes Pilotage Act. Although the plaintiff in that case argued

that the agency’s response on remand was not entitled to

deferential Chevron review, the D.C. Circuit disagreed.

- 48 -
Specifically, the court found that Chevron deference was

appropriate because the Coast Guard was acting “pursuant to an

express delegation from Congress” and because its interpretation

addressed “interstitial questions” that the agency “deserve[d]

deference to address.” Id. at 331-32 (citing Barnhart v.

Walton, 535 U.S. 212, 222 (2002); see also Mylan Labs., Inc. v.

Thompson, 389 F.3d 1272, 1280 (D.C. Cir. 2004)). The court

found that the agency was not required to conduct notice-and-

comment rulemaking procedures or engage in a formal adjudicatory

process for its statutory interpretation to warrant deferential

review. Menkes, 637 F.3d at 332-33. Rather, the court

concluded that “the Coast Guard’s enunciation of the aforecited

statutory interpretations and rules has the ‘force of law,’

. . . especially given the instruction from this court to the

agency to ‘come to grips with the meaning of the statute.’” Id.

at 332.

Because this Court finds that the court’s opinion in Menkes

bears directly on the question before it, it is bound to follow

the D.C. Circuit’s approach. Here, as in Menkes, the Court

required the Service to grapple with the ambiguities in the

ESA’s definition of the term “endangered species,” pursuant to

the agency’s express authority to make listing determinations

case-by-case in light of the best available science for each

species. The Court expressly did not require the agency to

- 49 -
adopt independent, broad-based criteria or prospective policy

guidance regarding the interpretation of the phrase “in danger

of extinction” in the ESA. Further, the Court expressly did not

require the agency to conduct notice-and-comment rulemaking

procedures or to engage in additional fact-finding. Given the

narrow scope of the remand order in this case, the Court is

persuaded that the agency’s Supplemental Explanation qualifies

for deferential review under Chevron. 26

ii. Merits

As set forth below, having carefully considered the

agency’s Supplemental Explanation, the parties’ arguments

contained in both the original and supplemental briefing, and

the relevant case law, the Court finds that it must uphold the

Service’s conclusion that the polar bear was not endangered at

the time of listing under step two of the Chevron framework.

26
While the Court is sensitive to CBD’s concerns that the
agency’s Supplemental Explanation may constitute post hoc
rationalization, it finds persuasive the D.C. Circuit’s
reasoning in Alpharma, Inc. v. Leavitt, 460 F.3d 1,6 (D.C. Cir.
2006), in which the court noted that it would make no sense for
a court to order a remand for supplemental explanation only to
then reject that explanation as post hoc rationalization.
Moreover, the Court is persuaded that the agency’s Supplemental
Explanation does not constitute impermissible post hoc
rationalization because the agency decision-makers themselves
developed and approved it. See Pub. Citizen v. FMCSA, 374 F.3d
1209, 1218 (D.C. Cir. 2004) (noting that “[t]he expertise of the
agency . . . must be brought to bear” (citation omitted)).

- 50 -
As an initial matter, the Court finds that the agency’s

general understanding that an endangered species is “on the

brink of extinction” is not clearly out of line with

Congressional intent. 27 With that said, however, the agency’s

general understanding of the definition of an endangered species

is not the primary focus of the Court’s inquiry. Rather, as the

Court recognized in its remand order, the decision to list a

species as threatened or endangered is highly fact-specific.

See In re Polar Bear, 748 F. Supp. 2d at 28. On remand, the

agency maintains that the facts in the administrative record

show that the polar bear was not endangered as of 2008. The

relevant question before this Court, therefore, is whether that

conclusion was a reasonable one.

As discussed above, plaintiff CBD contends that the

agency’s conclusion is flawed because FWS improperly ignored or

discounted relevant factors. This Court disagrees. The Court

is not persuaded that the agency ignored or otherwise failed to

27
The agency’s determination that an endangered species is
“on the brink of extinction” draws from the primary distinction
between the categories of threatened and endangered species as
set forth in the text of the ESA. As this Court has previously
observed, there is a temporal element to the distinction between
the categories of endangered and threatened species. See In re
Polar Bear, 748 F. Supp. 2d at 26. This temporal distinction is
also frequently noted in the legislative history. See id. at 28
(noting that the legislative history emphasizes that an
endangered species “is” (currently or presently or actually) in
danger of extinction, whereas a threatened species is “likely to
become” so endangered).

- 51 -
consider any of the information cited by plaintiff CBD. All of

that information – including the population modeling data and

polar bear monitoring reports – is included in the voluminous

administrative record that was before the agency and, indeed,

much of that data was cited by the agency as a basis for

designating the polar bear as a threatened species. Notably,

CBD cites to the agency’s findings in the Listing Rule itself

for much of the evidence that it claims the agency ignored.

To the extent that CBD is asking this Court to find that

FWS drew improper conclusions from the scientific information it

considered, the Court declines to do so. Although the evidence

emphasized by CBD is very troubling, the Court finds that the

agency acted well within its discretion to weigh the available

facts and scientific information before it in reaching its

conclusion that the polar bear was not endangered at the time of

listing. 28 Where an agency has exercised its Congressionally-

28
Certainly, where global warming has been identified as the
primary threat to the polar bear’s sea ice habitat and the
agency has acknowledged that the global warming trend is
unlikely to reverse itself, a conclusion that the species is, in
some sense, “in danger of extinction” has undeniable appeal.
The USGS population models, which predict a trend of extinction
across three of the four polar bear ecoregions in as little as
75 years, particularly give the Court pause. However, the Court
cannot agree with CBD that the agency’s conclusions based on the
record, including these population models, rise to the level of
irrationality. Specifically, the Court accepts as reasonable
the agency’s explanation that it declined to find that these
preliminary, alpha-level population models, which came
relatively late in the decision-making process, were
- 52 -
authorized discretion to weigh the relevant factors, and it has

made a listing determination based on a reasoned choice, the

Court will not disturb its conclusion. See Animal Legal Def.

Fund v. Glickman, 204 F.3d 229, 235 (D.C. Cir. 2000) (“Where

Congress delegates power to an agency to regulate on the borders

of the unknown, courts cannot interfere with reasonable

interpretations of equivocal evidence.”). While CBD would have

weighed the facts differently, the Court is persuaded that FWS

carefully considered all of the available scientific information

before it, and its reasoned judgment is entitled to deference.

Finally, the Court is satisfied that the agency has

complied with its remand order to provide additional explanation

for the agency’s original “threatened” listing. Plaintiff CBD

has identified no compelling evidence demonstrating that the

agency’s proffered interpretation of the ESA is manifestly

contrary to the statute. Accordingly, the Court concludes that

the agency’s Supplemental Explanation sufficiently demonstrates

that the Service’s definition of an endangered species, as

applied to the polar bear, represents a permissible construction

of the ESA and must be upheld under step two of the Chevron

sufficiently persuasive to warrant an “endangered” listing for
the polar bear.

- 53 -
framework. 29 See Serono Labs. v. Shalala, 158 F.3d 1313, 1321

(D.C. Cir. 1998) (under deferential Chevron framework, a court

must uphold a reasonable construction of the statute, even if it

believes that another interpretation is more reasonable).

2. Joint Plaintiffs’ Claim that the Polar Bear
Should Not Have Been Considered Threatened at the
Time of Listing

The Court turns now to Joint Plaintiffs’ claim that FWS

similarly misinterpreted and misapplied the ESA when it

concluded that the polar bear is likely to become endangered

within the foreseeable future and thus qualified for threatened

status at the time the agency made its listing determination.

Joint Plaintiffs argue, first, that FWS failed to demonstrate

that the polar bear is sufficiently “likely” to become

endangered and, second, that FWS arbitrarily selected a 45-year

time period as the “foreseeable future” for the polar bear, when

a shorter time period would have been more appropriate. Each of

these arguments is addressed in turn.

29
Because the Court finds that the agency reasonably
concluded that the polar bear was not in danger of extinction in
any portion of its range at the time of listing, the Court will
not address CBD’s related argument that the Seasonal and
Divergent Ice Ecoregions constitute a “significant portion” of
the polar bear range. See 16 U.S.C. § 1532(6).
- 54 -
a. Joint Plaintiffs’ Argument that the Service
Failed to Demonstrate that the Polar Bear Is
67-90% Likely to Become Endangered

A threatened species under the ESA is a species that is

“likely to become an endangered species within the foreseeable

future throughout all or a significant portion of its range.”

16 U.S.C. § 1532(20). Joint Plaintiffs claim that FWS failed to

prove that the polar bear is sufficiently “likely” to become

endangered within the meaning of this definition. Specifically,

Joint Plaintiffs contend that FWS failed to demonstrate a 67-90%

likelihood that the polar bear will become endangered within the

foreseeable future.

As an initial matter, Congress did not define the term

“likely” in the ESA. FWS has not adopted regulations or other

guidance defining the term. Nor has any court defined the

term. 30 Joint Plaintiffs look instead to the IPCC’s Fourth

Assessment Report (“IPCC AR4”), which provides that, for the

purposes of its climate models and projections, a “likely”

30
The District of Oregon in Trout Unlimited v. Lohn is the
only court to have significantly discussed the term “likely” as
it appears in the ESA. 645 F. Supp. 2d 929 (D. Or. 2007). In
that case, the district court declined to define the term but
upheld as reasonable the National Marine Fisheries Service’s
interpretation of the term to mean “more likely than not.” Id.
at 944. The “more likely than not” standard has also previously
been adopted by FWS in interpreting the “threatened” designation
under the ESA. See W. Watersheds Project v. U.S. Forest Serv.,
535 F. Supp. 2d 1173, 1184 (D. Idaho 2007).

- 55 -
outcome is one that has a 67-90% probability of occurring. 31 ARL

151195 n.6. Joint Plaintiffs assert that this standard of

likelihood is relevant not only because FWS relied in part on

the climate models in the IPCC AR4 in reaching its “threatened”

determination for the polar bear, but also because FWS itself

purportedly adopted this numerical standard of likelihood for

the purposes of making its listing decision. In support of this

argument, Joint Plaintiffs point specifically to a statement in

the agency’s response to comments on the proposed rule, in which

FWS noted that it “attempted to use [the terms “unlikely,”

“likely,” and “very likely”] in a manner consistent with how

they are used in the IPCC AR4.” ARL 117241. According to Joint

Plaintiffs, therefore, this statement indicates that the agency

adopted this high numerical standard of likelihood for all

purposes, including statutory interpretation of the term

“likely” as it appears in the ESA. 32

31
According to IPCC standards, a “more likely than not”
outcome has a 50-66% probability of occurring. A “very likely”
outcome is one that has more than a 90-95% probability of
occurring; an “extremely likely” outcome has a 96-99%
probability of occurring; and a “virtually certain” outcome has
a greater than 99% probability of occurring. ARL 151195 n.6.
32
In their reply brief, Joint Plaintiffs raise the
alternative argument that even if FWS did not specifically adopt
this particular numerical standard, the Listing Rule should then
be overturned because the agency failed to adopt any standard
for determining whether the polar bear is “likely” to become
endangered. See JP Reply, Docket No. 170, at 14. To the extent
the Court considers this new argument that was raised improperly
- 56 -
In making this argument, it is not Joint Plaintiffs’

position that FWS adopted an impermissible construction of the

statute. To the contrary, Joint Plaintiffs appear to suggest

that a 67-90% standard of likelihood would be reasonable. See

JP Mot. at 10 (noting that 67-90% is consistent with dictionary

definition of the term “likely”). Instead, Joint Plaintiffs

assert that, having adopted this high standard, FWS subsequently

failed to meet that standard when it relied on highly uncertain

climate and population modeling. For this reason, Joint

Plaintiffs conclude, the agency’s determination that the polar

bear is likely to become endangered was arbitrary and

capricious.

The federal defendants respond that FWS did not adopt any

numerical definition of the term “likely” in the Listing Rule,

let alone the unreasonably high standard of 67-90%. They assert

that Joint Plaintiffs have simply taken out of context a

statement that was intended to refer only to the standards used

to assess the reliability of climate models, which is “entirely

separate from the ultimate standard under the ESA for

determining whether a species meets the statutory definition of

threatened based on the entirety of the available science and

for the first time on reply, the Court is persuaded that the
agency articulated a reasoned basis for its listing
determination for the polar bear, notwithstanding the fact that
it did not purport to define the term “likely” in its Listing
Rule.
- 57 -
the five listing factors.” Fed. Def. Mot. at 56. Indeed, the

federal defendants point out that the very next sentence of the

agency’s response to comments refers explicitly to “the

limitations and uncertainties of the climate models and their

projections.” ARL 117241. This statement suggests that the

agency intended to apply the numerical standard cited by Joint

Plaintiffs only to those climate models, which are only part of

a voluminous administrative record, and not more broadly.

According to the federal defendants, because Joint Plaintiffs

incorrectly assume that the agency adopted a quantitative

definition of the term “likely,” their attempt to show non-

compliance with this standard must fail. 33

The threshold question before the Court, therefore, is

whether FWS in fact adopted the Joint Plaintiffs’ proffered

numerical definition of the term “likely.” Having carefully

reviewed the administrative record, the Court is not persuaded

that FWS adopted a numerical standard of 67-90% probability in

determining whether the polar bear is “likely” to become

endangered. Although the only arguable definition of the term

“likely” in the Listing Rule appears in the response to comments

that Joint Plaintiffs have highlighted, the Court agrees with

33
The federal defendants also argue that, regardless of how
the term “likely” could be numerically defined, the agency’s
determination for the polar bear easily would meet that
standard.

- 58 -
the federal defendants that this lone statement does not

demonstrate the agency’s intent to adopt the IPCC’s numerical

standards for all purposes, including statutory construction.

Indeed, a close review of the record belies any such

intention. The record reveals that FWS used the terms “likely”

and “very likely” interchangeably throughout its Listing Rule.

See, e.g., ARL 117245 (“Because of the habitat changes

anticipated in the next 40-50 years, and the corresponding

reductions in reproduction and survival, and, ultimately,

population numbers, we have determined that the polar bear is

likely to be in danger of extinction throughout all or a

significant portion of its range by 2050.” (emphasis added));

ARL 117252 (“[W]e conclude that the species is not currently in

danger of extinction throughout all or a significant portion of

its range, but is very likely to become so within the

foreseeable future.” (emphasis added)). The Court concludes

that if FWS had intended to imbue these terms with the

mathematical precision urged by Joint Plaintiffs for the

purposes of statutory construction, it would have used these

terms more deliberately.

Because the Court finds that FWS did not adopt a statutory

interpretation that would require a showing that at the time of

listing the polar bear had a 67-90% likelihood of becoming

endangered within the foreseeable future in order to be listed

- 59 -
as a threatened species, the Court declines to reach Joint

Plaintiffs’ claim that the agency failed to make such a showing.

Accordingly, the Court concludes that the Listing Rule is not

arbitrary and capricious on these grounds.

b. Joint Plaintiffs’ Argument that the Service
Arbitrarily Selected 45 Years As the
“Foreseeable Future” Timeframe for the Polar
Bear

The Court turns now to Joint Plaintiffs’ argument that the

Service’s choice of a “foreseeable future” timeframe over which

the polar bear is likely to become endangered was arbitrary and

capricious. In its Listing Rule, FWS defined the “foreseeable

future” as “the timeframe over which the best available

scientific data allow us to reliably assess the effects of

threats on the polar bear,” and it concluded based on record

evidence that it could confidently predict potential impacts to

the polar bear from sea ice losses over a 45-year period. ARL

117257. Joint Plaintiffs argue that the agency’s choice of 45

years as the foreseeable future for the polar bear was arbitrary

and was based on inappropriate factors. 34 They further contend

34
Plaintiff CBD also challenges the Service’s choice of a 45-
year timeframe for the polar bear. Plaintiff CBD contends that
the “foreseeable future” for the polar bear should be extended
beyond 45 years to the year 2100. The Court finds CBD’s claim
perplexing. The basis of CBD’s argument appears to be that
impacts to the polar bear over the next 100 years were not only
foreseeable at the time of listing but were also drastic enough
to warrant listing the species as endangered. By definition,
however, a “foreseeable future” determination is only relevant
- 60 -
that FWS erred when it failed to consider whether any time

period shorter than 45 years would be more appropriately

foreseeable. The Court will address these arguments in turn.

Joint Plaintiffs raise two significant arguments in support

of their claim that the 45-year time period was arbitrarily

chosen. First, Joint Plaintiffs claim that the agency’s choice

of a 45-year time period was inappropriately based only on

biological factors (e.g., life history characteristics of the

polar bear) rather than on what the agency could actually

foresee. Citing to the proposed rule for the polar bear, Joint

Plaintiffs assert that FWS initially chose a 45-year timeframe

because it corresponds roughly to three polar bear generations. 35

According to Joint Plaintiffs, FWS later modified its analysis

at the final rule stage in an attempt to justify its arbitrary

for threatened species. See 16 U.S.C. § 1532(20). FWS
determined that impacts to the polar bear over the next 45 years
were sufficiently foreseeable to warrant listing the species as
threatened as of 2008. Therefore, impacts to the polar bear
beyond year 45 were not relevant to the agency’s listing
determination.
35
Joint Plaintiffs also argue that, to the extent FWS relied
on biological considerations, FWS incorrectly calculated the
generation length of a polar bear. As the federal defendants
point out, Joint Plaintiffs never raised this point before the
agency, and it is well-established in this Circuit that issues
not raised before the agency are waived. See Nat’l Wildlife
Fed’n v. EPA, 286 F.3d 554, 562 (D.C. Cir. 2002). Even assuming
the argument is not waived, however, plaintiffs point to no
evidence suggesting that a different calculation of polar bear
generation length would render the agency’s conclusion arbitrary
and capricious.
- 61 -
choice by pointing to sources of scientific data, including IPCC

reports and other climate projections. Second, Joint Plaintiffs

argue that FWS should have considered what is “foreseeable” with

respect to all five of the ESA’s statutory listing factors

(i.e., habitat loss, overutilization, regulatory mechanisms,

disease, and other manmade factors). This kind of comprehensive

review, Joint Plaintiffs argue, would have enabled the agency to

make a more accurate assessment of the species’ likelihood of

becoming endangered because other factors may offset a

foreseeable threat. Focusing specifically on regulatory

mechanisms (“Listing Factor D”), Joint Plaintiffs contend that

“because the Service cannot reasonably ‘foresee’ or predict

anything about existing regulatory mechanisms in 45 years, that

period is too long.” JP Mot. at 14.

The federal defendants respond that FWS reasonably defined

the foreseeable future as 45 years because it found that it

could make confident forecasts about polar bear population

trends up to that point, based on climate modeling and other

reliable data. Specifically, the federal defendants assert,

climate change projections from the IPCC AR4 supported a 45-year

foreseeable future timeframe at the time of listing. As the

federal defendants describe, model outcomes reported in the IPCC

AR4, which FWS accepted as the best available science on climate

change, consistently predict a certain base level of overall

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warming through mid-century, regardless of whether actual

emissions increase or decrease over that period. Fed. Def. Mot.

at 73 (citing ARL 117279). FWS found, relying on these IPCC

reports, that beyond that point the choice of emission scenario

begins to influence model outcomes more significantly. See ARL

117233. According to FWS, therefore, at the time the agency

made its listing decision minimum impacts to Arctic sea ice

could be predicted with confidence for up to fifty years but

projections became more speculative beyond that point.

As the federal defendants point out, FWS also acknowledged

that a 45-year period roughly corresponds to three polar bear

generations. However, according to the federal defendants, the

agency found this correlation to be relevant because population

status projections will generally be even more reliable if they

correspond in some way to the life history characteristics of

the species. See ARL 117258. Specifically, the federal

defendants assert, FWS determined that population projections

that can be made over multiple polar bear generations are more

reliable than projections that only span one generation. The

federal defendants contend that it was not irrational for FWS to

rely on biological factors in this way to support its choice of

a foreseeable future timeframe for its listing decision.

With respect to Joint Plaintiffs’ argument that FWS erred

when it failed to consider what is “foreseeable” for all five

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listing factors, and particularly Listing Factor D (“existing

regulatory mechanisms”), the federal defendants respond that the

statute contains no such requirement. Indeed, the federal

defendants assert, the “suggestion that the Service could forego

listing the polar bear under Factor D based on wholly

speculative and uncertain future regulatory mechanisms is

contrary to the ESA.” Fed. Def. Mot. at 75. Moreover, there is

no evidence in the record, according to the federal defendants,

that any regulatory mechanisms have been or will be implemented

that would effectively address the loss of sea ice within the

foreseeable future. As such, the federal defendants conclude,

Joint Plaintiffs’ argument lacks merit.

As with the term “likely,” Congress has not defined the

term “foreseeable future” under the ESA, and FWS has not

promulgated any regulations or other policy guidance defining

the term. At least one court has recognized that what is

“foreseeable” is likely to vary from species to species

depending on a number of factors and, therefore, a bright-line

rule of foreseeability is inappropriate. See W. Watersheds

Project v. Foss, No. 06-1574, 2005 U.S. Dist. LEXIS 45753, at

*44-45 (E.D. Pa. Aug. 19, 2005) (noting that “the definition of

‘foreseeable future’ may vary depending on the particular

species - for example, ‘foreseeable future’ may be defined

differently for a sequoia tree . . . than for the slickspot

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peppergrass, which is an annual or biennial plant”). In the

absence of a quantitative standard, a “foreseeable future”

determination is made on the basis of the agency’s reasoned

judgment in light of the best available science for the species

under consideration. See id. (declining to establish a bright-

line rule but noting that the agency must articulate a

satisfactory explanation for its definition).

Having carefully considered the parties’ arguments and the

administrative record, the Court rejects Joint Plaintiffs’

argument that the choice of a 45-year foreseeable future

timeframe for the polar bear was arbitrary and based on improper

considerations. Contrary to Joint Plaintiffs’ assertions, FWS

does not appear to have based its choice solely on biological

factors, even at the proposed rule stage. To the extent this

Court considers the agency’s proposed rule, which is not the

action before it on review, the Court finds that the agency

sufficiently explained that its decision was based on “IUCN

criteria, 36 the life-history and population dynamics of polar

bears, documented changes to date in both multi-year and annual

36
A 45-year time period for the foreseeable future is
consistent with the work of the international Polar Bear
Specialist Group, which reassessed the status of the polar bear
in June 2005 for the purposes of the International Union for the
Conservation of Nature’s (“IUCN”) Red List classification, a
list of species considered to be threatened. ARL 117258.
Although the standards for Red Listing classification differ
from ESA listing standards, FWS nonetheless found the IUCN
assessment to be instructive. See ARL 117254.
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sea ice, and the direction of projected rates of change of sea

ice in future decades,” which all supported a 45-year or three-

generation timeframe for the foreseeable future. ARL 59992.

Moreover, the final Listing Rule indicates that the climate

change projections found in the IPCC AR4 – and not biological

factors – were the primary basis for the Service’s determination

of the foreseeable future timeframe. See ARL 117257. In light

of the IPCC AR4 findings, the Court is satisfied that the agency

articulated a rational basis for its choice.

The Court also rejects Joint Plaintiffs’ argument that FWS

erred by failing to “foresee” future developments with respect

to all five listing factors over the next 45 years. Notably,

Joint Plaintiffs do not contend that the ESA required FWS to

conduct such an analysis; they assert only that it would have

resulted in a more accurate conclusion. Here, however, a review

of the Listing Rule reveals that the agency in fact took all

five listing factors into account, and it considered whether

those factors would affect the likelihood that the polar bear

will become endangered within the foreseeable future. With

respect to overutilization (“Listing Factor B”), for example,

the agency found that harvest “is likely exacerbating the

effects of habitat loss in several populations” and that polar

bear mortality from harvest “may in the future approach

unsustainable levels for several populations” as these

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populations begin to experience the stresses of habitat change.

ARL 117284. Further, with respect to regulatory mechanisms

(“Listing Factor D”), the agency concluded that there are no

known regulatory mechanisms that could effectively address the

primary threat to the polar bear from future sea ice losses. 37

To the extent the agency was required to consider other listing

factors, the Court is satisfied that FWS did so.

Finally, Joint Plaintiffs argue that even though FWS

considered impacts to the polar bear over a 45-year time period

to be reasonably foreseeable, FWS nonetheless erred when it

failed to consider a shorter timeframe, which would likely be

more foreseeable. The applicable standard, however, is not

whether the agency could have taken a more reasonable approach.

The agency must only show that the approach it took was a

rational one. See Envtl. Def. Fund v. Costle, 657 F.2d 275, 283

(D.C. Cir. 1981) (“[The APA standard] mandates judicial

affirmance if a rational basis for the agency’s decision is

presented . . . even though [a court] might otherwise

disagree.”). Although Joint Plaintiffs may have less confidence

37
The ESA does not require FWS to “foresee” what regulatory
mechanisms will be in place in the future - it is only required
to take existing regulatory mechanisms into account in its
listing determination. 16 U.S.C. § 1533(a)(1)(D); Biodiversity
Legal Found. v. Babbitt, 943 F. Supp. 23, 26 (D.D.C. 1996); see
also Or. Natural Res. Council v. Daley, 6 F. Supp. 2d 1139,
1153-54 (D. Or. 1998).

- 67 -
than FWS in the conclusions that the agency reached, that is not

an appropriate basis for invalidating an agency’s rational

choice, particularly in matters requiring scientific or

technical expertise. See Marsh v. Or. Natural Res. Council, 490

U.S. 360, 375-77 (1989). Accordingly, the Court concludes that

FWS appropriately exercised its discretion in selecting a 45-

year “foreseeable future” timeframe for the polar bear.

B. The Service Articulated a Rational Basis for Its
Conclusion that No Polar Bear Population or Ecoregion
Qualifies As a “Distinct Population Segment”

Whereas plaintiff CBD and Joint Plaintiffs primarily focus

on the question of whether the polar bear warranted endangered

or threatened status throughout its range in 2008, a subset of

plaintiffs argue, in the alternative, that FWS should have

differentiated among the various polar bear populations and/or

ecoregions according to their relative levels of risk in making

its listing decision. Specifically, plaintiffs CBD, SCI, and CF

assert that FWS erred when it declined to designate any polar

bear population or ecoregion as a distinct population segment

(“DPS”) under the ESA, which would have allowed the agency to

tailor ESA protections more narrowly. The common question

presented by these three plaintiffs is whether FWS arbitrarily

determined that no polar bear population or ecoregion is

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sufficiently “discrete” for the purposes of a DPS designation. 38

The Court turns now to that question.

1. The Service’s Policy

The term “species” as it is used in the ESA includes “any

distinct population segment of any species of vertebrate fish or

wildlife which interbreeds when mature.” 16 U.S.C. § 1532(16)

(emphasis added). Congress did not further define the term

“distinct population segment,” nor is the term defined in

scientific discourse. In 1996, however, FWS and NMFS jointly

promulgated a “Policy Regarding the Recognition of Distinct

Vertebrate Population Segments Under the Endangered Species Act”

(“DPS Policy”), 61 Fed. Reg. 4722 (Feb. 7, 1996), which provides

38
In a related claim, plaintiffs SCI and CF further assert
that FWS arbitrarily failed to consider using its authority to
list the polar bear in only part of its range. Essentially,
these plaintiffs claim that FWS erred by failing to consider
whether any portion of the polar bear range did not warrant
listing as threatened. The Court concludes that this claim has
no merit. As a threshold matter, in light of recent court
opinions, it is unclear whether the agency has the authority to
list a species in only a portion of its range without going
through the process of a DPS designation. See generally Federal
Defendants’ Notice of Withdrawal of M-37013, Docket No. 258
(citing Defenders of Wildlife v. Salazar, 729 F. Supp. 2d 1207
(D. Mont. 2010)). Further, the Court finds that FWS
sufficiently considered whether any portion of the polar bear
population did not warrant listing under the ESA. This
assessment is implied in the agency’s conclusion that the polar
bear did warrant listing throughout its range. FWS provided
ample explanation in its Listing Rule for why polar bears range-
wide are likely to become endangered within the foreseeable
future and, as a result, warranted at least a “threatened”
designation. The Court is therefore persuaded that FWS did not
arbitrarily fail to consider this issue.
- 69 -
guidance to both agencies in applying the term “distinct

population segment” for the purposes of an ESA listing.

Pursuant to this policy, FWS may designate a DPS to avoid

listing an entire species where only a portion of its population

warrants ESA protections. See Nat’l Ass’n of Home Builders v.

Norton, 340 F.3d 835, 842 (9th Cir. 2003).

The DPS Policy outlines three elements to be considered in

evaluating a possible DPS:

1. The discreteness of the population segment in
relation to the remainder of the species to which it
belongs;
2. The significance of the population segment to the
species to which it belongs; and
3. The population segment’s conservation status in
relation to the Act’s standards for listing . . . .

DPS Policy, 61 Fed. Reg. at 4725. These considerations are to

be evaluated sequentially – i.e., FWS must first determine that

the population segment is discrete before it can consider

whether that segment is also significant. Id. If, however, a

population segment is found to be both discrete and significant,

FWS may consider whether that segment is threatened or

endangered as defined by the ESA. Id.

A population segment is “discrete” when it satisfies either

one of the following conditions:

1. It is “markedly separated” from other populations of
the same taxon as a consequence of physical,
physiological, ecological, or behavioral factors.
Quantitative measures of genetic or morphological

- 70 -
discontinuity may provide evidence of this
separation.

2. It is delimited by international governmental
boundaries within which differences in control of
exploitation, management of habitat, conservation
status, or regulatory mechanisms exist that are
significant in light of [the five ESA listing
factors].

Id. The test for discreteness under the agencies’ DPS Policy is

not intended to be particularly rigid. Id. at 4724. For

example, it does not require absolute reproductive isolation but

allows for some interchange among population segments. Id. The

purpose of the distinctness criterion is merely to ensure that a

DPS can be reasonably defined and described in order to ensure

effective administration and enforcement of the Act. Id.

Nonetheless, both the “discreteness” criterion and the

“significance” criterion were adopted to ensure that FWS uses

its authority to list DPS’s “sparingly,” at the urging of

Congress. Id. at 4725 (citing S. Rep. No. 96-151, at 7 (1979)).

DPS designation is primarily intended to enable protection and

recovery of declining organisms in a more timely and less costly

manner, and on a smaller scale, than would be required for an

entire species or subspecies. DPS Policy, 61 Fed. Reg. at 4725.

It is not a tactic for subdividing a larger population that FWS

has already determined, on the same information, warrants

listing across a larger range. See Friends of the Wild Swan v.

U.S. FWS, 12 F. Supp. 2d 1121, 1133 (D. Or. 1997).

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At least two courts have acknowledged that the term

“distinct population segment” in the ESA is ambiguous, and,

therefore, the agency’s interpretation and application of that

term falls within step two of a Chevron analysis and is entitled

to deference. See Nw. Ecosystem Alliance v. U.S. FWS, 475 F.3d

1136, 1141-43 (9th Cir. 2007); State of Maine v. Norton, 257 F.

Supp. 2d 357, 385 (D. Me. 2003). Both courts upheld the

agency’s 1996 DPS Policy as a reasonable interpretation of the

ESA. 39 Nw. Ecosystem Alliance, 475 F.3d at 1145; State of Maine

v. Norton, 257 F. Supp. 2d at 387.

2. Plaintiffs CBD, SCI, and CF’s Claim that the
Service Wrongly Concluded that No Polar Bear
Population or Ecoregion Is “Discrete”

In its Listing Rule, FWS considered whether any distinct

population segments exist for the polar bear. As an initial

matter, FWS considered whether any polar bear population or

ecoregion is “discrete” within the meaning of its DPS Policy.

The agency determined that, while different populations exhibit

minor differences of behavior, genetics, and life-history

parameters, no population or geographic area is markedly

separated as a consequence of physical, physiological,

ecological, or behavioral factors. ARL 117298. In the

Service’s estimation, the minor differences between individual

39
The DPS Policy itself has not been challenged by any party
in this case and is not before this Court on review.
- 72 -
populations and ecoregions do not outweigh the similarities that

are most relevant to the polar bear’s conservation status – in

particular, the species’ universal reliance on sea ice habitat

for critical life functions. ARL 117298. As the federal

defendants note, “[w]hile polar bears adopt different strategies

to deal with the seasonal absence of sea-ice . . . their

response to declining sea ice is essentially the same, with the

same negative result: they suffer nutritional stress because

they spend longer amounts of time outside of their preferred

sea-ice habitats where seals are accessible.” Fed. Def. Mot. at

104 (citing ARL 117274). Accordingly, FWS concluded that no

portion of the polar bear population is sufficiently “discrete”

to qualify for designation as a DPS.

Plaintiffs CBD, CF, and SCI contend that, contrary to

record evidence, FWS arbitrarily determined that no polar bear

population is “markedly separated” from other populations. 40 In

40
In addition to its claim that FWS reached a conclusion that
is contrary to the evidence, CBD raises two additional claims:
(1) that the agency failed to consider behavioral differences
among the polar bear populations; and (2) that the agency failed
to consider whether any ecoregion qualifies as a DPS. The Court
cannot agree that the agency failed to consider either issue.
First, FWS did acknowledge behavioral differences among polar
bear populations but deemed these differences to be minor in
comparison to their relevant similarities. See ARL 117298.
Second, FWS appears to have considered whether any polar bear
population segment - including ecoregions - qualifies as a DPS:

Although polar bears within different populations or
ecoregions (as defined by Amstrup et al. 2007) may
- 73 -
support of their argument, plaintiffs point to evidence from the

record which purportedly demonstrates that USGS scientists,

polar bear experts, and the MMC all have identified distinctions

among the world’s polar bear populations and, particularly, the

four ecoregions. In light of this record evidence, plaintiffs

argue that the Service’s conclusion that there is no marked

separation among polar bear population groups was irrational.

Plaintiff CBD points primarily to comments from various

reviewers suggesting that the draft final listing rule did not

adequately reflect the importance of the ecoregion structure for

polar bears. For example, USGS reviewers noted:

An important, and fairly emphatic, conclusion from the
body of 2007 USGS work was that the life-history
dynamics, demography, and present and future status of
polar bears in the 4 ecoregions are different, owing
largely to different ice dynamics, its spatiotemporal
availability, how it has responded to global warming
and how it is predicted to respond in the future. In
these Ecoregions, the relationships between polar
bears and their sea ice habitat are fundamentally
different.

See CBD Mot. at 38 (citing ARL 88920).

have minor differences in demographic parameters,
behavior, or life history strategies, in general polar
bears have a similar dependence upon sea ice habitats,
rely upon similar prey, and exhibit similar life
history characteristics throughout their range.

ARL 117298 (emphasis added). Finally, FWS separately determined
that the polar bear was not endangered in any portion of its
range at the time of listing, including three specific
populations and at least two ecoregions. See ARL 117299-301.

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USGS commenters also rejected the agency’s assessment in

the draft final rule that “there are no morphological, or

physiological differences across the range of the species that

may indicate adaptations to environmental variations.” CBD Mot.

at 38 (citing ARL 96589). In response to this statement, USGS

reviewers wrote:

This statement does not seem to us to be true. We do
see unique life history components that are related to
where a polar bear lives within the overall range.
That is, the polar bears in the seasonal ice ecoregion
come ashore and fast for 4-8 months while polar bears
in the polar basin may be on ice and never come to
land – they may den on ice. . . . This statement seems
to contradict the ecoregion idea – that there are some
major differences in the ice regimes that do influence
how polar bears make a living in the different parts
of their range.

ARL 96841.

One particularly troubling comment that CBD highlights is

USGS’s statement that “a careful reading of Amstrup et al (2007)

[the polar bear status report that formed the basis for the

Listing Rule] might lead to a different conclusion than that

reached by the Service.” ARL 101097. USGS goes on:

Taken at face value, the outcomes from the Bayesian
Network Modeling are that polar bear populations
living in the Seasonal and Divergent ecoregions are
most likely extinct within the foreseeable future
. . . . The fates of the populations living in the
Convergent and Archipelago ecoregions are different,
with a much smaller probability of being smaller than
the present or extinct. The Draft Final Rule does not
clearly articulate the scientific reasoning behind
dismissing an “endangered” designation for parts of
the range . . . . How did the scientific evidence lead

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to the status determination of “threatened” vs
“endangered”?

ARL 101097 (emphasis added). 41

The federal defendants respond that FWS reached a

reasonable conclusion, even in light of this record evidence.

The defendants assert that, on balance, the agency found that

there are no significant morphological or physiological

differences (i.e., differences in physical form or function)

among polar bears that indicated physical, evolutionary

adaptations to environmental differences in the particular

areas, and that the small genetic differences among polar bears

in different areas are “not sufficient to distinguish population

segments.” ARL 117298. According to defendants, the record

does not show the “marked separation” among either populations

41
Plaintiff CBD also points to a 2008 report from Canadian
polar bear researchers, which concluded that polar bears may be
appropriately managed in “designatable units.” ARL 127663. The
Canadian Species at Risk Act (“SARA”), like the ESA, allows for
the protection of sub-units of species that are genetically
and/or geographically distinct (so-called “designatable units”
or “DUs”). ARL 127663. The authors of this Canadian study
noted that “polar bears belong to ecosystems that differ
fundamentally in their structure and functioning (e.g., sea ice
regime, biological productivity, prey species and availability,
etc.). . . . Thus, it appears that, although all polar bears in
Canada belong to a single species they do not share a single,
uniform conservation status.” ARL 127668. On this basis, the
authors recommended analyzing the Canadian polar bear population
in terms of five distinct genetic units that also represent
distinct ecological and geographic groups. ARL 127680.
Plaintiff CBD cites to this study as further evidence that polar
bear populations are sufficiently distinct to qualify for
designation as DPS under the ESA.

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or ecoregions that is a pre-requisite for designating a DPS.

Therefore, the defendants contend, FWS reasonably concluded that

no polar bear population or ecoregion is “discrete,” applying

the standards set out in the agency’s DPS Policy.

3. The Court’s Analysis

Having carefully considered the parties’ arguments and the

administrative record, the Court finds that it must defer to the

agency’s application of its DPS Policy. The Court notes that,

as FWS has acknowledged, there are some recognized differences

among polar bear ecoregions and even some differences from

population to population. Each population is apparently

distinguishable enough to be identified as discrete for

management purposes, and the boundaries of these populations

have been identified and confirmed over decades of scientific

study and monitoring. See ARL 139247. Nonetheless, while these

recognized distinctions would seem to be enough to satisfy the

minimal criterion

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Source: Frix Law Library, https://www.frixlaw.com/law-library/cases/2664083. Public record. Not legal advice.