Around 2,300 individuals succumbed to heat-related illnesses across 12 European cities during the intense heatwave that concluded last week, according to a study conducted by scientists at Imperial College London and the London School of Hygiene and Tropical Medicine.
Large parts of Western Europe experienced extreme heat, with temperatures exceeding 40 degrees Celsius (104°F) in Spain and wildfires in France, during a 10-day period ending July 2, Reuters said in a report, quoting from the study.
The 10-day period was the focus of the study.
Climate change intensified the heatwave, contributing to 1,500 of the estimated 2,300 deaths during this period, according to the study.
Dr Ben Clarke, a researcher at Imperial College London was quoted in the Reuters report:
Climate change has made it significantly hotter than it would have been, which in turn makes it a lot more dangerous.
Methodology employed
Researchers analysed 12 cities, including Barcelona, Madrid, London, and Milan. They found that climate change has led to an increase of up to 4 degrees Celsius in heatwave temperatures within these cities.
To estimate the death toll, researchers employed established epidemiological models and historical mortality data.
This reflected deaths where heat was the underlying cause, even if exposure worsened pre-existing health conditions.
The research team emphasised that their methodology for estimating the death toll was based on rigorous, peer-reviewed scientific protocols.
This approach was critical due to a significant challenge in accurately reporting heat-related fatalities: a large proportion of these deaths often go officially unreported.
Furthermore, some governmental bodies either lack the infrastructure to collect such data comprehensively or choose not to disclose it publicly.
By employing these validated methods, the scientists were able to rapidly generate a more realistic and comprehensive assessment of the mortality associated with heat, addressing the inherent limitations of official reporting mechanisms.
June 2025 temperatures soar
In a significant revelation from the EU’s Copernicus Climate Change Service, last month has been officially recorded as the third-hottest June in planetary history.
This concerning milestone places June 2025 squarely behind the record-breaking temperatures experienced in June 2024 and June 2023, according to their latest monthly bulletin released on Wednesday.
The consistent ranking of recent Junes among the warmest ever underscores a clear and escalating trend in global warming, prompting renewed calls for urgent climate action.
Copernicus reported that Western Europe endured its warmest June on record, characterised by widespread “very strong heat stress,” indicating perceived temperatures of 38 degrees Celsius or higher.
Samantha Burgess, Copernicus’ strategic lead for climate said:
In a warming world, heatwaves are likely to become more frequent, more intense and impact more people across Europe.
New research from European health institutes in 2023 indicated that heat preparedness efforts in European countries are critically insufficient.
The studies suggest that as many as 61,000 deaths in Europe during the 2022 heatwaves could be attributed to the extreme temperatures.
Greenhouse gas emissions, primarily from burning fossil fuels, have led to a rise in the planet’s average temperature. This elevated baseline temperature means that heatwaves now reach even higher peaks.
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