Study finds climate change fingerprints on July heat waves in Europe, China and America

A sign displays an an unofficial temperature as jets taxi at Sky Harbor International Airport at dusk, July 12, 2023, in Phoenix.

Several climate scientists, using tree rings and other stand-ins for temperature records, say this month’s heat is likely the hottest Earth has been in about 120,000 years, easily the hottest of human civilization.“Had there been no climate change, such an event would almost never have occurred,” said study lead author Mariam Zachariah, a climate scientist at Imperial College of London.

But the climate is not stabilized, even at this level. If it warms a few more tenths of a degree, this month’s heat will become even more common, Otto said. Phoenix has had a record-shattering 25 straight days of temperatures at or above 110 degrees Fahrenheit and more than a week when the nighttime temperature never dropped below 90 degrees Fahrenheit

The way scientists do these rapid analyses is by comparing observations of current weather in the three regions to repeated computer simulations of “a world that might have been without climate change,” said study co-author Izidine Pinto, a climate scientist at the Royal Netherlands Meteorological Institute.

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