Associated Press undefined The winter weather that has overwhelmed power grids unprepared for climate change and left millions without electricity in record-breaking cold kept its grip on the nation's midsection Wednesday. At least 20 people have died, some while struggling to find warmth inside their homes. In the Houston area, one family succumbed to carbon monoxide from car exhaust in their garage; another perished after flames spread from their fireplace. Blame the polar vortex, a weather pattern that usually keeps to the arctic, but is increasingly visiting lower latitudes and staying beyond its welcome. Scientists say global warming caused by […]

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