What you need to know about the polar vortex and global warming

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A man crosses a street in whiteout conditions during a winter storm in Buffalo, New York, U.S., January 30, 2019. Photo credit: Lindsay Dedario/Reuters

Arctic temperatures are hitting the midwest, while Australia experiences a heat wave. Heat records were broken all over last year, from Hong Kong to Norway to Southern California. Scientists say many extreme cold weather events could also be the result of global warming.