Global warming sign? Major Arctic glacier is cracking

A scientist predicts the disintegration of a major part of the Northern Hemisphere's biggest floating glacier within a year. But is it normal stress or a sign of climate change? In northern Greenland, a part of the Arctic that had seemed immune from global warming, new satellite images show a growing giant crack and an 11-square-mile chunk of ice hemorrhaging off a major glacier, scientists said Thursday.

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