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Saturday, August 30, 2008 |
Saturday, August 30, 2008 |
Photo: Global Warming "Tipping Points" Reached, Scientist SaysA prominent climatologist has said that Earth has already reached many "tipping points"—including the melting of large amounts of ice—and an immediate curb on fossil-fuel use is needed or humans risk reaching a "point of no return." Image courtesy NASA
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