Greenland’s Ice Sheet Melting

    This Monday, July 16, 2012 satellite image provided by NASA shows calving, crescent-shaped crack at center, on the Petermann Glacier in northwestern Greenland. An iceberg twice the size of Manhattan tore off one of Greenland's largest glaciers. Scientists had been watching the 15-mile long crack in the floating ice shelf of the northerly Petermann Glacier for several years. On Monday NASA satellites showed it had broken completely, forming a 46 square mile iceberg. Petermann spawned an iceberg twice that size in 2010. (AP Photo/NASA)

    NASA / AP Photo

    Greenland’s surface melted an “unprecedented” amount this past month, shedding a larger area of ice than has been detected in 30 years, even in the country’s coldest areas. Over just four days, the area of thawed ice went from 40 to 97 percent. Greenland usually sheds about half of its ice sheet over the summer, but the speed with which it’s melting this year has been described as “extraordinary.” “When we see melted places that we haven’t seen before, at least in a long period of time, it makes you sit up and ask what’s happening,” said one NASA scientist. “It’s a big signal, the meaning of which we’re going to sort out for years to come.”

    Read it at BBC