Ice is broken up by the passing of the Finnish icebreaker MSV Nordica as it sails through the Chukchi Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 2017. The region has become a magnet for nations wanting to exploit the Arctic’s rich oil reserves and other natural resources and for scientists seeking to understand global warming and its impacts on the sea and wildlife. (AP Photo/David Goldman)
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