Chief engineer Jukka-Pekka Silander watches from the bow of the the Finnish icebreaker MSV Nordica as it sails into floating sea ice on the Beaufort Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 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)
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