Climate Change and Health: The Impact of the 2025 European Heatwave
The summer of 2025 kicked off with a severe heatwave in Europe, setting temperature records and triggering health alerts and social disruptions. A study by the Grantham Institute Climate Change and Environment at Imperial College London found that climate change played a significant role in driving heat-related deaths during this period, tripling the expected mortality rate. The heatwave was caused by a high-pressure system known as a "heat dome" that trapped warm air over Western Europe and intensified the heat by drawing warm air from North Africa.
The extreme heatwave not only led to health alerts but also increased the demand for health services and electricity, straining critical infrastructure and raising the risk of wildfires in Eastern Europe, the Balkans, and Turkey. The study estimated 2305 excess deaths due to heat across 12 major European cities during the 10-day period, with 1504 deaths directly linked to climate change. Older populations, especially those over 65 years old, were the most affected, highlighting the vulnerability of unacclimatized populations.
The study emphasized the need for urgent adaptation measures to address the escalating risks posed by climate change, population aging, and urbanization. Urban heat island effects were identified as critical risk hotspots, with cities absorbing and re-emitting more heat than rural areas. While heat-action plans and early warning systems are being implemented, there is a pressing need to accelerate new adaptation measures to protect public health.
Despite the importance of adaptation, long-term protection requires global mitigation efforts to reduce reliance on fossil fuels. The study highlighted the increasing pressure on health systems as a result of climate change and emphasized the need for decisive action across all sectors to build climate-resilient communities and health systems. It called for preparedness among physicians to care for patients affected by future heatwaves, emphasizing the urgent need for proactive measures to address this public health crisis.