Alaska just had the most ridiculous summer. That’s a red flag for the planet.
(CNN) -- Alaska's summer of fire and no ice is smashing records. With the Arctic warming twice as fast as the rest of the planet, America's "Last Frontier" feels like the first in line to see, smell and feel the unsettling signs of a climate in crisis. There are the smoky skies and dripping glaciers, dead salmon and hauled-out walrus but scientists also worry about the changes that are harder to see, from toxic algae blooms in the Bering Sea to insects from the Lower 48 bringing new diseases north.
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