A block of ice four times the size of Manhattan has split off from a Greenland glacier and melted--an event so dramatic that it's shocked the scientists who study the area. Scientists now worry that another block of ice--about two times the size of Manhattan--is preparing to break off, according to the New York Times. Greenland's ice sheet may be melting at the rate of 400 billion tons per year. According to MSNBC, Greenland has lost "592.6 square miles of ice between 2000 and 2010." The break happened in 2010, but this is the first time photos have been available. MadOne
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