Extreme heat is a silent killer that sweeps through cities, countryside and beaches. More than 1,500 people died as a result of the latest heat wave that swept across Europe between late June and early July. A study by Imperial College London and the London School of Hygiene & Tropical Medicine confirms that 65 percent of the deaths recorded during the latest heat wave to hit Europe can be attributed to climate change. Rising temperatures were responsible for an estimated 317 excess deaths in Milan, 286 in Barcelona, 235 in Paris, 171 in London, 164 in Rome, 108 in Madrid, 96 in Athens, 47 in Budapest, 31 in Zagreb, 21 in Frankfurt, 21 in Lisbon, and 6 in Sassari. This means that the likely death toll from climate change-driven heat in many European cities was higher than other recent disasters, including the 2024 Valencia floods (224 deaths) and the 2021 floods in northwestern Europe (243 deaths). Extreme heat has led to restrictions on outdoor work hours in Italy, the closure of more than 1,300 schools in France, the shutdown of a nuclear reactor in Switzerland, and the outbreak of fires in Greece, Spain, and Turkey.