Climate Change Linked to 50,000 Heat-Related Deaths Across Europe, Study Finds

Climate Change Blamed for Over 32,000 Heat Deaths in Europe This Summer, Study Finds

More than 50,000 people died from heat-related causes across Europe this summer, with nearly two-thirds of the deaths attributed to human-caused climate change, according to a new study.

Researchers analysed heat-related mortality across 854 European cities during heat waves in June, July and August. Their findings estimated that 50,391 people died due to high temperatures, including 32,619 deaths linked to additional heat caused by the burning of fossil fuels such as coal, oil and gas.

The study, scheduled for publication in Nature Health, found that this summer’s estimated death toll was 71% higher than the previous record of 29,480 deaths in 2022. The researchers cautioned that the actual toll could be higher because their analysis excluded a deadly heat wave in May and covered cities representing approximately 40% of Europe’s population.

June Heat Wave Accounted for One-Third of Deaths

Around one-third of the estimated deaths occurred between June 17 and July 1, during an especially intense heat wave when temperatures reached 5.3 degrees Celsius (9.5 degrees Fahrenheit) above normal, said study co-author Garyfallos Konstantinoudis, a biostatistician at Imperial College London.

Lead author Clair Barnes, a climate scientist at the same institution, said many parts of Western and Northern Europe lacked infrastructure capable of coping with the extreme temperatures now being experienced. In some European cities, temperatures were reportedly as much as 12 degrees Celsius (21.6 degrees Fahrenheit) above normal.

The researchers found that Italy, France, Spain and Germany recorded the highest numbers of heat-related deaths. A separate analysis by the same team found that Rome had the highest cumulative heat-related death toll among European capitals between 2000 and 2025.

Barnes said Europe was the world’s fastest-warming continent, although the Arctic region was warming even faster. Europe’s temperatures are now approximately 2.5 degrees Celsius (4.5 degrees Fahrenheit) above pre-industrial levels, she said.

She explained that the additional warming caused by human activities can push temperatures from uncomfortable levels into dangerous and potentially fatal ranges.

Elderly People Among the Most Vulnerable

People aged 85 and above accounted for more than half of the estimated heat-related deaths this summer. However, extreme temperatures also claimed the lives of more than 800 people aged between 20 and 44, Konstantinoudis said.

The researchers used established statistical models to distinguish deaths associated with naturally occurring summer heat from those attributable to human-induced climate change.

They compared computer simulations representing a world without climate change against estimates based on the temperatures experienced this summer. The difference was used to calculate the additional deaths associated with global warming.

According to Barnes, the proportion of heat-related deaths attributed to climate change has increased from around 45% in the early 2000s to approximately 65% today.

Dr Howard Frumkin, former director of the US National Center for Environmental Health, who was not involved in the study, said rising summer temperatures and improvements in analytical methods were contributing to increasingly accurate estimates of heat-related mortality.

Heat Deaths Often Go Unreported

The researchers relied on statistical modelling to estimate the overall death toll because heat-related deaths are frequently underreported and may not be explicitly recorded on death certificates.

Several outside experts described the methodology as state-of-the-art. The researchers used a mathematical model previously applied in peer-reviewed studies, accounting for the age of residents and local temperature patterns in each of the 854 cities.

The calculations were based on each city’s optimal temperature associated with the lowest mortality. Temperatures above or below that level were then used to estimate excess deaths.

The team also compared its calculations with estimates from government agencies. For heat waves affecting Britain in May and June, the researchers estimated approximately 2,700 excess deaths, while the UK’s health statistics agency reported around 2,800, Konstantinoudis said.

Experts Call for Heat Preparedness and Emissions Cuts

Experts have called for stronger measures to protect vulnerable populations as Europe faces increasingly intense heat waves.

Dr Courtney Howard, a Canadian emergency physician and president-elect of the Canadian Medical Association, who was not involved in the research, urged governments to invest in heat early-warning systems, affordable low-carbon cooling and neighbourhood support networks for people most at risk.

She also called for rapid reductions in fossil fuel consumption, which drives human-caused climate change.

Dr Jonathan Patz, a professor of health and the environment at the University of Wisconsin-Madison, similarly stressed that adaptation alone would not be sufficient. He said governments needed to improve cooling facilities and protect vulnerable communities while addressing the underlying causes of global warming.

The study adds to growing evidence of the human cost of rising temperatures and highlights the need for both immediate public-health measures and long-term action to reduce greenhouse gas emissions.