The Arctic is showing stunning winter warmth, and these scientists think they know why

Last month, temperatures in the high Arctic spiked dramatically, some 36 degrees Fahrenheit above normal — a move that corresponded with record low levels of Arctic sea ice during a time of year when this ice is supposed to be expanding during the freezing polar night. And now this week we’re seeing another huge burst of Arctic warmth. A buoy close to the North Pole just...

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