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Ice Melt_Hass.jpg

An iceberg in or just outside the Ilulissat fjord on May 30, 2012, likely was created from Jakobshavn Isbrae, the fastest glacier in west Greenland. Polar ice sheets are now melting three times faster than in the 1990s, but so far that's added just less than half an inch to already rising global sea levels, a new giant scientific study says. While the amount of sea level rise isn't as bad as some earlier worst case scenarios, the acceleration of the melting, especially in Greenland, has ice scientists worried. (AP Photo/Ian Joughin)