Europe’s Deadliest Summer Kills 50,000

Fifty thousand and thirty-nine people died across Europe during the heat waves of June, July, and August, according to a new study set to appear in Nature Health. Researchers from Imperial College London determined that 32,619 of those deaths resulted directly from the additional heat generated by burning coal, oil, and gas.

The death toll is 71 percent higher than the previous record set in 2022, when the same team counted 29,480 heat-related fatalities. The authors note that their figures likely represent an underestimate because they exclude a deadly heat wave in May and cover only 854 cities, which hold roughly 40 percent of Europe’s population. Italy, France, Spain, and Germany recorded the highest numbers of deaths.

Between June 17 and July 1, temperatures ran 5.3 degrees Celsius above normal, accounting for about one-third of the total deaths, said co-author Garyfallos Konstantinoudis, a biostatistician at Imperial College London. While more than half of the victims were aged 85 or older, the heat also killed more than 800 people between the ages of 20 and 44.

Lead author Clair Barnes, a climate scientist at Imperial College London, stated that some cities experienced temperatures 12 degrees Celsius above normal this summer. She explained that much of Western and Northern Europe lacks infrastructure designed for the temperatures now caused by human-caused warming. Barnes added that Europe is the fastest-warming continent, now 2.5 degrees Celsius hotter than pre-industrial levels.

To isolate the effect of global warming, the team compared actual deaths with computer simulations of a world without climate change. Barnes said the share of heat deaths attributable to warming has risen from about 45 percent in the early 2000s to 65 percent today. The researchers relied on statistical modeling to account for age and each city’s optimal temperature, a method they validated against government estimates. For the May and June heat waves in Britain, the model produced 2,700 excess deaths, closely matching the 2,800 reported by the United Kingdom’s health statistics agency.

Dr. Howard Frumkin, former director of the National Center for Environmental Health in the U.S., noted that summers are getting hotter while attribution tools are becoming more accurate. Outside experts, including Dr. Courtney Howard of the Canadian Medical Association, called for investment in early-warning systems and equitable access to low-carbon cooling. Dr. Jonathan Patz of the University of Wisconsin-Madison stressed the need to address fossil fuel burning to stop the cycle of heat-related mortality.