Human-caused warming accounted for roughly two-thirds of an estimated 50,391 heat-related deaths in European cities during summer 2026, according to research released on October 23 by Imperial College London and the London School of Hygiene & Tropical Medicine. The analysis links fossil fuel emissions to a growing urban mortality burden.
Researchers examined June through August in 854 urban areas across the 27 EU countries, Britain, Norway and Switzerland. These places represent about 40% of the population of the 30 countries studied. The estimate therefore covers selected urban populations, rather than the entire continent, and excludes heat episodes outside those summer months.
The team combined weather observations and climate models with established relationships between temperature, age and mortality. It compared present conditions with a hypothetical world without human-caused warming. Imperial's report estimates the overall toll at 50,391; Associated Press reporting puts the portion attributed to added warming at 32,619.
These figures are statistical estimates, not a count of death certificates identifying heat as the cause. LSHTM says the calculations depend on assumptions about exposed populations and historical temperature–mortality relationships. Similar methods have previously produced estimates close to figures later reported by national authorities, but that does not remove uncertainty from the current findings.
According to LSHTM, nearly one-third of the estimated deaths occurred between June 17 and July 1, when regional daily temperatures averaged more than 5°C above the 1991–2020 baseline. Older people faced the greatest burden, although about 6,000 estimated deaths involved people younger than 65. The British estimate was around 4,500 across 135 urban areas.
The authors call for greenhouse gas cuts alongside stronger heat protection, including warning systems, improvements to homes and healthcare facilities, and more urban shade and green space. LSHTM researcher Pierre Masselot said cities are poorly adapted to rising temperatures. Lead author Clair Barnes stressed both reducing fossil fuel use and targeted protection for those most vulnerable to extreme heat.
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