The fingerprints of climate change are all over the intense heat waves gripping the globe this month, a new study finds. Researchers say the deadly hot spells in the American Southwest and Southern Europe could not have happened without the continuing buildup of warming gases in the air.
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. The particularly intense heat waves that Texas, California, Arizona, New Mexico, Nevada, Baja California, Sonora, Chihuahua and Coahuila are now roasting through are likely to happen about once every 15 years in the current climate, the study said.
Because the weather attribution researchers started their analysis of three simultaneous heat waves on July 17, the results are not yet peer reviewed, which is the gold standard for science. But it used scientifically valid techniques, the team’s research regularly gets published and several outside experts told the Associated Press it makes sense.