Thinning and retreating ice could spell precipitous decline for Arctic sea ice.
As of Sept. 21, 2007, sea ice extent stood at 4.18 million square kilometers (1.61 million square miles), an increase of 50,000 square kilometers (19,000 square ...
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As of Sept. 21, 2007, sea ice extent stood at 4.18 million square kilometers (1.61 million square miles), an increase of 50,000 square kilometers (19,000 square ...
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