When 40 climate experts huddled in a small conference room near Washington, D.C., last September, all eyes were on an atmospheric scientist named Jennifer Francis. Three years ago, Francis proposed that the warming Arctic is changing weather patterns in temperate latitudes by altering the behavior of the northern polar jet stream, the high, fast-moving river of air that snakes around the top of the world. The idea neatly linked climate change to weather, and it has resonated with the press, the public, and powerful policymakers. But that day, Francis knew that many of her colleagues—including some in that room—were deeply skeptical of the idea, and irritated by its high profile.
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