Greenpeace

As the world's largest terrestrial carnivore, the polar bear is the king of the great white north. It might come as a surprise then that this majestic species faces an uncertain future: Climate change is causing the disappearance of sea ice from which polar bears hunt their prey. Research funded by WWF found that with less time on the ice to hunt for food and store it leaves polar bears hungry and hinders reproduction. If current climate trends continue unabated, polar bears could become extinct by the end of this century.