Sometime between 2070 and 2099, assuming “business as usual” between now and then as regards the use of fossil fuels, the following will occur:

+ For the equivalent of a week or more each year, about 120 million people across the U.S.A. will be exposed to conditions so hot, the heat index (or “feels like” temperature, which is produced by the combination of heat and humidity) will surpass the limits of the National Weather Service’s heat index charts. Depending on locality at that time, the upper limit of the heat index scale could be at or above 127°F (52.8°C)

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