When did the polar bear become endangered?

Polar bears are classified as marine mammals because they spend most of their lives on the sea ice of the Arctic Ocean. They have a thick layer of body fat and a water-repellant coat that insulates them from the cold air and water. read more

According to the National Wildlife Federation, polar bears are in danger of extinction due to global warming. In 2008, the bears became the first vertebrate animal to be listed by the United States Endangered Species Act as in danger of becoming extinct due primarily to global warming. read more