Photo: Arctic Warming Faster Above Ground Level, Study Finds

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The sun sets over thinning ice in the Arctic Circle in this undated photo.

Scientists have long known that the surface of the Arctic is warming twice as quickly as the global average. But a new study has found that the air about a mile above the surface is warming even more quickly than that—which suggests atmospheric circulation plays a far larger role in climate change than previously thought.

Photograph by Jeremy Harbeck/NASA

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