Greenland is losing about 40 trillion pounds more ice a year than scientists had thought, according to a new study that used GPS to help estimate how much is melting.

So instead of losing on average 550 trillion pounds of ice each year between 2003 and 2013, Greenland lost about 590 trillion pounds , said co-author Michael Bevis of Ohio State University in a study published Wednesday in the journal Science Advances . That’s about a 7.6 percent difference.

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