Rise in heat-related fatalities linked to climate change, according to recent study
A recent study conducted by teams including Imperial College London and the London School of Hygiene & Tropical Medicine has revealed that approximately 1,500 heat-related deaths in Europe during a 10-day heatwave in late June to early July 2025 can be attributed to human-driven climate change.
Researchers focused on 12 European cities during this period and found a total of around 2,300 heat-related deaths across these cities. It was discovered that around 65% (1,500 people) of these deaths would not have occurred without the extra warming caused by climate change, which made the heatwave 1-4°C hotter and significantly more deadly.
The study underscores the impact of fossil fuel burning and associated global warming on human mortality during extreme temperature events in Europe. The heatwave, often referred to as a "silent killer," is known for causing tens of thousands of deaths in previous summers, particularly among vulnerable groups such as the elderly, people with heart disease, diabetes, respiratory problems, and those living in cities.
Heatwaves in Europe have been increasing in frequency and severity, with last June being the hottest month on record in Western Europe, according to the EU Earth observation program Copernicus. In fact, worldwide, last June was the third hottest June on record.
The study found that cities such as Paris, with 373 heat-related deaths, and Barcelona, with 340, experienced significantly higher numbers of deaths than usual during the heatwave. If it weren't for the warming caused by climate change, around 800 people would have died from heat in these cities. Similarly, in Milan alone, 499 more people died than usual during the hot days at the end of June.
Climate scientists emphasise the urgency of addressing climate change to prevent such tragedies. Friederike Otto, a climate scientist, warns that burning more oil, coal, and gas will lead to more heat-related deaths. Ben Clarke, another climate scientist, states that the study on heat deaths highlights the danger of the current global warming of 1.3 degrees.
To combat the effects of climate change and protect vulnerable populations, the study urges the expansion of renewable energy, making cities more heat-resistant, and ensuring adequate healthcare systems can cope with the increased strain caused by extreme temperatures. Otto also stresses the importance of protecting the most vulnerable populations, as most deaths occur at home or in hospitals, away from the public eye, and are rarely reported.
As the world continues to grapple with the effects of global warming, it is crucial to take action to reduce greenhouse gas emissions and build resilient cities that can withstand the challenges posed by extreme weather events.
- The study on heat-related deaths during the European heatwave in late June to early July 2025 highlights the role of human-driven climate change in exacerbating health-and-wellness issues, as it was found that around 65% of the total deaths were attributable to the extra warming caused by climate change.
- The findings of the research emphasize the significance of focusing on areas such as environmental-science, as the commercial burning of fossil fuels and associated global warming has been linked to an increase in heat-related deaths during extreme temperature events.
- Beyond the immediate effects on human health, climate change also poses a threat to overall science, as the study's findings underscore the importance of addressing mental-health concerns among the population, particularly during extreme weather events, and the need for resilient cities to mitigate the impact of climate change on vulnerable groups.
