NASA satellites reveal that the surface of Greenland’s massive ice sheet has melted this month over an unusually large area. NASA has been monitoring the Greenland melt for 30 years, and they’re calling this one "unprecedented," partly because it’s so large and also because it occurred at the COLDEST part of the country, Summit station. The thawed area went from 40% of the ice sheet to 97% in just four days, starting on July 8th.
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