Polar bears are now in critical danger. The U.S. Geological Survey says in just 40 years there may be no polar bears left in Alaska, and more than two thirds of polar bears around the world will disappear.
The sea ice polar bears depend on to hunt and to raise their cubs is melting. And it is melting rapidly. What's worse- some experts say the polar bear's dire situation is really a warning of what could happen around the globe if we don't act now.
Jane Velez-Mitchell spoke to David Mizejewski, naturalist for the National Wildlife Federation who just returned from an excursion in Manitoba, Canada.