Heat killed a record 50,000 people in European cities this summer, new research suggests, with scientists blaming climate breakdown for two in every three of the deaths.

Morgues and funeral homes filled with bodies from June to August as the heat added by planet-baking pollution cut short an extra 32,000 lives in urban areas, the researchers found. Hot days pushed vulnerable bodies into overdrive and warm nights prevented them from recovering.

The “staggering” death toll, modelled using historical relationships between heat and health in 854 cities, was the worst on record, the study found.…