State of the Planet's Wildlife: Climate Change May be a Death Sentence for Polar Bears

Climate change is not a theory. It's a reality here in the Arctic. For polar bears -- climate change may be a death sentence. To hunt for seals -- which is their primary source of food -- the bears must first swim long distances until they find stable sea ice. Without the ice, the bears cannot survive.

Matt Damon hosts " The State of the Planet's Wildlife," from the long-running environmental television series JOURNEY TO PLANET EARTH.

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