Researchers look out from the Finnish icebreaker MSV Nordica as the sun sets over sea ice floating on the Victoria Strait along the Northwest Passage in the Canadian Arctic Archipelago, Friday, July 21, 2017. Sea ice plays an important role in the global climate system by cooling the surrounding water and air. It helps maintain ocean and atmospheric currents that affect weather which is characteristic for certain parts of the world, such as the comparatively mild temperatures found in western Europe. (AP Photo/David Goldman) **FILE**
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