 Sea ice breaks apart by the passing of the Finnish icebreaker MSV Nordica as it traverses the Northwest Passage through the Victoria Strait in the Canadian Arctic Archipelago Friday, July 21, 2017. Scientists believe there is no way to reverse the decline in Arctic sea ice in the foreseeable future. Even in the best-case scenario envisaged by the 2015 Paris climate accord, sea ice will largely vanish from the Arctic during the summer within the coming decades. (AP Photo/David Goldman) 