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Tuesday, October 7, 2008 |
Tuesday, October 7, 2008 |
Photo: Polar Bears Proposed for U.S. Endangered Species ListScientists have linked the ice loss to human-caused global warming—raising the prospect that the proposal could eventually lead to federal curbs on greenhouse gas emissions. Photograph by Flip Nicklin/NGS
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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