A record-breaking heatwave is affecting millions of people in Europe, with temperatures above 40°C in countries like France, Spain, Germany, and Italy. Britain also recorded its hottest June temperature at 36.7°C. Many schools have closed, transport is cancelled, and hospitals are treating more people for heat-related illnesses.

Scientists from the World Weather Attribution group say the main cause of this extreme heat is climate change from greenhouse gas emissions. These gases come from burning fossil fuels like coal, oil, and gas. The researchers found this heatwave is about 3.5°C hotter than it would have been in 1976.

Because of this heatwave, 45% of over 800 cities studied in Europe have seen or will see their highest levels of heat stress. Heat stress happens when temperature and humidity are both high, making it dangerous for older adults, children, and sick people.