Northern Hemisphere faces 4-fold rise in extreme heat periods: study


Compound hot extremes, 24-hour periods where daytime and nighttime temperatures stay exceptionally high, pose a significant risk to human health

The number of extreme hot days and nights in the Northern Hemisphere could quadruple by the end of the century even if humanity brings down emissions to meet the Paris climate deal goals, scientists said Tuesday.

So-called compound hot extremes, 24-hour periods where daytime and nighttime temperatures stay exceptionally high, pose a significant risk to human health as the body doesn’t get a chance to cool off after the Sun sets.
Researchers in China analysed temperature data from the Northern Hemisphere—home to 90 percent of humanity—stretching back to 1960.
They found a clear upward trend in the frequency and intensity of compound hot days and nights, defined as days in which the temperature high and low were both in the…



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