If and when the nation warms another 4.5 degrees, expect there to be around 15 heat records for every cold one, the new study in Monday's Proceedings of the National Academy of Sciences predicts. That warming can be as early as 50 years from now if greenhouse gas emissions — from the burning of coal, oil and gas — continue at their recent pace or a century away if carbon pollution slows down, said study lead author Gerald Meehl, senior scientist at the National Center for Atmospheric Research.
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