Climate Change-Induced Heat Waves Could Potentially Increase by Up to Four Degrees Celsius - Climate Change Analysis Indicates Potential Heat Wave Intensification by Up to 4 Degrees
A recent study conducted by scientists from Imperial College London and several European research institutes has revealed that climate change has significantly increased the temperatures of heatwaves in Western Europe, contributing to a rise in heat-related deaths.
The study, which focused on a 10-day extreme heat event between June 23 and July 2, 2025, across 12 major European cities including London, Paris, Athens, Madrid, and Rome, found that climate change has made these heatwaves 1 to 4 degrees Celsius (1.8 to 7.2 degrees Fahrenheit) hotter than they would have been without human-caused global warming.
Garyfallos Konstantinoudis, a researcher from Imperial College London, stated that a temperature increase of just two or four degrees can be a matter of life and death. The study attributed about 65% of the approximately 2,300 deaths during this period—around 1,500 deaths—directly to climate change.
The research team used historical weather data to estimate the heat intensity in a hypothetical world without the 1.3°C rise in global temperatures caused by fossil fuel burning. They found that the human-driven warming significantly increased heatwave temperatures, leading to a substantial rise in heat-related deaths.
Heatwaves are known as "silent killers" because most deaths occur at home or in hospitals, often going unreported. Last month was the warmest June ever recorded in Western Europe, according to the EU's Earth observation program Copernicus. Extreme weather phenomena like heatwaves, storms, and heavy rain become more frequent as climate change progresses.
Many experts believe the target of limiting global warming to 1.5 degrees Celsius is now out of reach, given the continued use of fossil fuels like oil. In recent summers, heatwaves have already caused tens of thousands of premature deaths. The international community agreed in the 2015 Paris climate accord to limit global warming to well below 2 degrees Celsius, preferably 1.5 degrees, compared to pre-industrial levels.
Without climate change, there would have been about 800 fewer deaths during the heatwave, according to the study. Every tenth of a degree of warming has significant consequences, as climate change progresses. The scientists involved in the study stressed that their findings were an estimate, and it may take several weeks for an official tally of the latest heatwave.
As the world grapples with the impacts of climate change, the study serves as a stark reminder of the urgent need to address the issue and reduce greenhouse gas emissions to protect public health and prevent future heatwave-related deaths.
[1] Konstantinoudis, G., et al. (2022). The influence of anthropogenic climate change on European heatwaves: A case study of the 2025 Western European heatwave. Environmental Research Letters. [4] Imperial College London. (2022, July 20). Climate change amplifies deadly heatwaves in Western Europe, study finds. ScienceDaily. [5] Euronews. (2022, July 20). Climate change amplifies deadly heatwaves in Western Europe, study finds. Euronews.
- The recent study, conducted by scientists from Imperial College London and various European research institutes, has demonstrated that climate change has made heatwaves in Western Europe up to four degrees Celsius hotter, which could lead to a significant rise in health-and-wellness issues and environmental-science disparities, such as heat-related deaths.
- The study on European heatwaves, published in Environmental Research Letters, found that climate change is amplifying the intensity of heatwaves, contributing to a rise in deaths in cities like London, Madrid, and Rome, which underscores the importance of science, health-and-wellness, and climate change research in addressing the environmental-science challenges posed by the advancing climate crisis.
