Melting ice sheet 'like water running off a shed'

January 13, 2015 1:12 AM

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Over a few summer days in 2012, nearly all of the Greenland ice sheet surface thawed right under the feet of a team of scientists.

What was not absorbed into snow quickly gathered and flowed across the 20,000-square-mile sheet, coalescing into roaring turquoise rivers. And then most of it disappeared.

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