The polar vortex explained in two minutes

Here, from John Holdren, who is President Obama’s science and technology adviser, is an explanation — in just two minutes — of the polar vortex and why climate change makes it more likely that we will see more extreme weather in the future.

Valerie Strauss covers education and runs The Answer Sheet blog.
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UGC FROM ARTICLE: !!!

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Valerie Strauss | January 23