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Cold snaps like the ones that hit the eastern United States in the past winters are not a consequence of climate change. Scientists have shown that global warming actually tends to reduce temperature variability. They used climate simulations and theoretical arguments to show that in most places, the range of temperature fluctuations will decrease as the climate warms. Not only will cold snaps become rarer simply because the climate is warming, but their frequency will be reduced because fluctuations about the warming mean temperature also become smaller. [Source: ETH Zurich]
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