Mystery of Greenland's Ice Lingers as Sheet Shrinks - Scientists have cautioned that a warming planet could melt Greenland's vast ice sheet, a potentially catastrophic event that would raise sea levels and inundate coastal communities around the globe. Yet while they puzzle over when and whether this might happen, they're also mystified over how the giant island formed so much ice in the first place. Greenland's ice sheet is the second largest in the world, behind only Antarctica.
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