Most polar bears could disappear by 2100: Study

Most polar bears could disappear from Arctic by 2100 due to global warming, according to a new study. Scientists say 'aggressive' cuts to greenhouse gas emissions are needed to save the mammals from extinction. The bears rely on the ice, which forms above the open waters, to reach their prey. A loss of the ice caused by global warming will force the animals on to land, where they must rely on fat reserves due to a lack of food.