NBC Learn   |  May 03, 2011

Permafrost is thawing rapidly

The frozen ground that covers the top of the world has been thawing rapidly over the last three decades. But there is cause for concern beyond the far north, because the carbon released from thawing permafrost could raise global temeratures even higher. NBC's Anne Thompson reports for "Changing Planet," produced by NBC Learn in partnership with the National Science Foundation.

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