US lists polar bears as endangered species
Warming Arctic brings invasion of southern species
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Polar bear, Description, Habitat, & Facts
Study connects greenhouse gas emissions to polar bear population
Polar bears become the face of climate change as Arctic ice caps
Polar Bears The Marine Mammal Center
Polar bears are inbreeding due to melting sea ice, posing risk to
Polar bear population - WWF Arctic
Polar bears get species listing – The Denver Post
Polar Bears: One Species at a Time