<p>These undated handout images provided by NASA shows the extent of surface melt over Greenland?s ice sheet on July 8, left, and July 12, right. Measurements from three satellites showed that on July 8, about 40 percent of the ice sheet had undergone thawing at or near the surface. In just a few days, the melting had dramatically accelerated and an estimated 97 percent of the ice sheet surface had thawed by July 12. In the image, the areas classified as ?probable melt…
July 25, 2012
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July 25, 2012 9:15 p.m.
NASA: Strange and sudden massive ice melt in Greenland
Scientists don't know if event is natural occurrence
WASHINGTON - Nearly all of Greenland's massive ice sheet suddenly started melting a bit this month, a freak event that surprised scientists.