This NASA Earth Observatory image obtained September 22, 2016 show some glaciers observed from the HU-25A Guardian aircraft on September 2, 2016, showing the Brückner and Heim glaciers where they flow into Johan Petersen Fjord in southeastern Greenland. Greenland's highly unstable ice sheet is melting more than seven percent faster than previously thought, scientists said this week after discovering a hotspot beneath the Earth's crust that was distorting their calculations. The study in the journal Science Advances raises concern about the increasing impact of melting ice on sea level rise, since Greenland is the second largest ice sheet in the world after the one in Antarctica. / AFP PHOTO / NASA Goddard / Jeremy HARBECK / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / JEREMY HARBECK/NASA GODDARD" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS ==TO GO WITH AFP STORY-"Greenland ice melting faster than thought"== JEREMY HARBECK/AFP/Getty Images
