Climate change is driving a significant rise in heat-related illnesses, infectious diseases, and allergic reactions across Europe, according to recent research published in The Lancet. Scientists warn that the health impacts of global warming are intensifying, affecting millions of people through longer pollen seasons, increased disease transmission risks, and more frequent extreme heat events.
The findings, led by researchers including Professor Johanne Klausen from Heidelberg University, compare data from 1991–2000 with 2015–2024 to assess shifts in climate-related health risks. Their analysis reveals that heat-related deaths have risen across 99.6% of European regions, with an average increase of 52 deaths per million people annually. The time during which even moderate physical activity becomes hazardous due to heat exposure has increased by an average of 60 hours per year.
Beyond heat stress, the study highlights how changing climate conditions are altering the spread of infectious diseases. The climatic suitability for dengue virus transmission in Europe has increased by 297% over the past decade compared to the 1981–2010 baseline, making local outbreaks more feasible. Researchers also note a lengthening of pollen seasons for key allergenic trees such as birch, alder, and olive, which now last one to two weeks longer than in the early 1990s due to warmer temperatures and higher carbon dioxide levels.
These environmental shifts contribute to heightened allergy symptoms and longer periods of discomfort for sensitive individuals. Experts emphasize that whereas the changes may not appear dramatic on an individual level, the cumulative effect is causing widespread, ongoing distress for tens of millions of Europeans who now face prolonged exposure to allergens and greater risks from heat and disease.
The research underscores the growing urgency of addressing climate change not only as an environmental issue but as a pressing public health challenge. As temperatures continue to rise and ecosystems shift, health systems across Europe may face increasing pressure from climate-related illnesses requiring both preventive strategies and adaptive responses.
For ongoing updates on climate and health developments, readers can refer to updates from The Lancet Countdown on health and climate change, which tracks global progress annually.
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