Less than a decade ago, most populations of polar bears were considered healthy, even growing. But climate change is impacting the population of this Arctic icon. In 2008, the U.S. Fish and Wildlife Service listed the polar bear  in Alaska as threatened. It was the first marine mammal listing under the Endangered Species Act  chalked up primarily to climate change. Without help, polar bears could disappear from U.S. shores by 2050.
Often referred to as the largest land carnivores in the world, polar bears are actually marine mammals, and spend much of their time on Arctic sea often ice hundreds of miles from land. Climate change  is melting their icy habitat, making it increasingly difficult to travel, hunt and raise their young. The sea ice they depend on melts earlier each spring and forms later each fall.
Oil and gas development also pose a major risk to polar bears. The threat of oil spills can come not only from oil and gas development but increasingly from unregulated arctic shipping. There is still no proven method of cleaning up oil in broken sea-ice conditions. An oil spill would not only harm polar bears, but could also deplete their prey and contaminate their habitat.