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After just a few days of intense melting this month, nearly the entire of the surface of Greenland’s massive ice sheet had turned to slush, NASA images showthe fastest thaw rate since satellites began keeping score 30 years ago.

"Ice cores from Summit show that melting events of this type occur about once every 150 years on average," with the last one happening in 1889

Scientists estimate that if all of Greenland’s ice sheet were to melt, the global sea level would rise by 23 feet (7 meters).

"To be perfectly clear, that is not what we’re seeing," Mote said. "Greenland is losing mass, but it would take a very long time to lose all of that mass."

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