Summer of 2025 has seen extreme heatwaves in Europe, with temperatures surpassing 40°C causing health-related fatalities and stress on resources. Research indicates increased frequency of heatwaves, with London now expected to face such events every 6 years. Of the estimated 2,300 heat-related deaths across major cities, 65% are attributed to fossil-fuel emissions. The impact is particularly severe on older populations, with nearly 90% of deaths occurring in those aged 65 and over, highlighting the urgent need for climate action and adaptation strategies.
From mid-June to early July, Western Europe experienced its highest average temperatures for this period in decades, the hottest June on record.
Research suggests that heatwaves in the region are becoming much more frequent - London can now expect events like this every 6 years instead of every 60.
Across 12 major European cities this year, about 1,500 of 2,300 estimated heat-related deaths - 65% - were driven by the extra heat resulting from fossil-fuel emissions.
High temperatures were especially lethal for older adults, with people aged 65 and over making up nearly 90% of those who died.
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