Greenhouse gas emissions are warming the nights faster than the days

Hot, humid nights can be dangerous because sweat has difficulty evaporating, scientists say. | Joyce Romero on Unsplash

If, over the summers, you feel like you are getting hotter and hotter when you fall asleep, you are unfortunately right. The week of July 18, for example, the inhabitants of the United Kingdom experienced the hottest night on record, with temperatures around 25.9°C in certain regions, accustomed to much milder climates.

However, while rising nighttime temperatures are a phenomenon that is becoming increasingly common across the globe, scientists have so far been unable to determine why nights seem to be warming faster than days. reports New Scientist magazine.

A recent analysis of the temperatures of the past seventy years carried out by researchers from the China University of Geosciences in Wuhan could provide some answers. Their study published on June 29 in the journal Geophysical Research Letters revealed that since 1951, “the difference between night and daytime temperatures has reduced by 0.41°C”.

After considering a number of scenarios, “including a world without human influence, another with greenhouse gases from human activities and another with air pollution”, the scientists came to the conclusion that the Most of this warming was due to greenhouse gas emissions. In question: “Warmer air contains more humidity, which increases the chances of having a cloudy sky, which reflects the sun’s rays during the day but retains heat during the night.”

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