Cold snaps like the one that just gripped the U.S. are far more rare thanks to global warming

The first week of January was the coldest such week on record in most locations in the Eastern United States. It was so frigid that week, and the week preceding it, that sea ice formed around Cape Cod and Chesapeake Bay, sharks froze to death on Massachusetts beaches, and alligators went into a resting state while entombed in ice. 

One might think that a cold snap like this one all but disproves global warming, or at least refutes the more dire scenarios about winter all but disappearing as the globe responds to sharp increases in greenhouse gases, such as carbon dioxide and methane. 

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