The summer of 2026 was brutally hot across Europe, with five successive heat waves causing record-high temperatures across the continent.

Those extremes likely led to more than 50,000 excess deaths in urban areas alone, according to a new estimate.

And some 32,000 of those deaths, or nearly two-thirds of that total, can be directly attributed to climate change, caused by the burning of fossil fuels.

This makes the summer of 2026 likely the “worst on record” for heat-related deaths across much of Europe, according to Clair Barnes, a study author and extreme weather and climate change researcher at Imperial College London.

Dangers of extreme heat

The figures come from two recent studies published in the journal Nature Health .

Researchers from Imperial College London and the London School of Hygiene & Tropical Medicine looked at 854 urban areas across 30 countries (27 of which are in the European Union, plus the UK, Norway and Switzerland).…