Rapid ice melt in Greenland

What is happening in Greenland?  Nearly all of its massive ice sheet started to melt over four days starting July 8.  Three satellites show what NASA calls unprecedented melting.  While most of the thick ice remains, scientists around the world are concerned because it happened quickly and over a widespread area.  NASA says the melting is far more than the past three decades which was about 55%.  Over four days, the ice melt went from 40% of the ice sheet to an unprecedented 97%.  Even its coldest and highest place also showed melting.  The last time that happened was in 1889 and happens only once in every 150 years.  

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