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This November 2008 photo provided by Polar Bears International shows polar bears on the coastline outside Churchill, Manitoba, Canada. Scientists and advocates point to polar bears, marked as “threatened” on the endangered species list, as the white-hot warning signal for the rest of the planet — “the canary in the cryosphere.” (BJ Kirschhoffer/Polar Bears International via AP)

This November 2008 photo provided by Polar Bears International shows polar bears on the coastline outside Churchill, Manitoba, Canada. Scientists and advocates point to polar bears, marked as “threatened” on the endangered species list, as the white-hot warning signal for the rest of the planet — “the canary in the cryosphere.” (BJ Kirschhoffer/Polar Bears International via AP)

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