12/18/2014 04:07 pm ET Updated Dec 18, 2014

Greenland's Ice Sheet Shifts Could Speed Melt

SAN FRANCISCO — New discoveries in Greenland’s warming ice sheet tell a chilling tale of change in its depths. Mysterious under-snow lakes pockmarking its edges and deep layers of ice at higher elevations both point to changes that could hasten melt and send water cascading into the ocean, pushing global sea levels ever higher.

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