The deadly freeze that swept the United States was extraordinary,but while scientists know that global warming can intensify extreme weather,the effects on winter storms are tricky to untangle. The winter storm that ravaged much of the United States and Canada through Christmas was expected to be bad,and it was. Forecasters billed it as a once in a generationevent even before ice began coating the steep streets of Seattle,white-out conditions spread from the Plains to the Midwest and more than four feet of snow was dumped on Buffalo in a storm that killed more than two dozen people.
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