Sea ice breaks apart as the Finnish icebreaker MSV Nordica traverses the Northwest Passage through the Victoria Strait in the Canadian Arctic Archipelago in a Friday, July 21, 2017, file photo. The National Snow and Ice Data Center's figures Monday, Sept. 21, 2020, show that sea ice last week was only 1.4 million square miles when it reached its annual low mark for the summer. In the 1980s it was always at least 1 million square miles more. (AP Photo/David Goldman, File)
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