With climate changes, polar bear and brown bear lineages intertwine

Thursday, July 7, 2011 - 12:30 in Earth & Climate

Polar bears' unique characteristics allow them to survive in one of the most extreme environments on Earth, but that survival is now threatened as rising temperatures and melting ice reshape the Arctic landscape. Now it appears that the stress of climate change, occurring both long ago and today, may be responsible for surprising twists in the bears' history and future as well.

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