"If you've been hearing that extreme cold spells like the one that we're having in the United States now disprove global warming, don't believe it," Holdren says in the video, before launching into a succinct explanation of how uneven global temperature changes are destabilizing the polar vortex and making it "wavier."
"The waviness means that there can be increased, larger excursions of wintertime cold air southward," Holdren says. He adds that "increased excursions of relatively warmer" air can also move into the "far north" as the globe warms.
White House Smacks Down Climate Deniers in Video
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