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10 places to visit before they vanish

Dec. 29, 2009, 11:49 a.m.
A tent pitched in the Alaskan tundra

Photo: BeastFace/Flickr

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Alaskan tundra

Global warming heats up the Arctic twice as fast as the rest of the world, meaning Alaska's beautiful northern tundra could vanish completely if temperatures continue to rise. As the tundra's permafrost melts, it not only drastically alters the ecosystem but also releases additional carbon — ironically hastening global warming.