FILE - In this Thursday, Aug. 3, 2017 file photo, a glacier calves icebergs into a fjord off the Greenland ice sheet in southeastern Greenland. Scientists from 17 nations are preparing for a year-long mission to the central Arctic to study the impact that climate change is having on the frigid far north of the planet. Mission leader Markus Rex said that researchers plan to anchor the German icebreaker RV Polarstern to a large floe and set up camp on the ice as the sea freezes around them, conducting experiments throughout the Arctic winter. (AP Photo/David Goldman, File)
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