Europe is grappling with an intense heatwave that scientists link to human-driven global warming, warning of longer and more extreme future events.
Recurring heatwaves are now seen as a defining signal of climate change, fuelled by fossil fuel emissions, researchers said.
Across the continent, cities and services are straining under soaring temperatures and mounting public health pressures.
In France, emergency calls in Paris surged by 80 percent compared with the same period last year, according to hospital authorities.
Meteo-France said remaining red alerts are expected to be lifted by Sunday night as conditions gradually ease.
A tragic toll has also emerged, with a toddler dying after being left in a hot car in Marseille during the extreme heat.
Record-breaking temperatures have been registered in multiple countries, including 41.3C in Germany, 38.8C in Switzerland, and 37.3C in the United Kingdom.
The World Meteorological Organization said the heatwave has “shattered numerous temperature records” and is impacting health, ecosystems, agriculture and productivity.
In Switzerland, operator Axpo shut down reactors at the Beznau nuclear plant, citing insufficient cooling as river temperatures rose.
Transport systems were also disrupted, with Eurostar passengers evacuated in Belgium after train breakdowns left them without air conditioning.
Meanwhile, a heat front is moving eastward, with forecasts of up to 39C across the Balkans, including North Macedonia, Serbia and Croatia.
Cultural and public events have been cancelled or disrupted, including a Dutch music festival and a Belgian Waterloo re-enactment.
In Munich, Pride organisers said the march will go ahead despite conditions, while Paris Pride was postponed over safety concerns.
Authorities in Poland warned of elevated wildfire risks and transport disruptions due to heat and infrastructure strain.
As Europe swelters, scientists warn the continent is entering a new climate reality marked by relentless and escalating heat extremes.