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  2. Arctic sea ice is in a downward spiral...

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Ice is broken up by the passing of the Finnish icebreaker MSV Nordica as it sails through the Beaufort Sea off the coast of Alaska in 2017. (AP Photo/David Goldman, File)
Ice is broken up by the passing of the Finnish icebreaker MSV Nordica as it sails through the Beaufort Sea off the coast of Alaska in 2017. (AP Photo/David Goldman, File)

If one...