The TLDR version of our new report on the urgent threats we face from man-made global heating. If this doesn't scare you, it should. We're acting in London, but we need global, coordinated action on the climate crisis immediately. • London could experience two or three times more heatwaves each year for the next 20 years. • UK-wide heat-related hospital attendances and admissions could triple by 2050 compared to current levels. These impacts are disproportionately concentrated in London. • We are already seeing the consequences. London experiences around 3,996 heat-related A&E attendances every year, around one and a half times the level seen elsewhere in England. • One million London homes may be at high risk of overheating, with more than 1,300 schools, 60 hospitals and 351 care homes located in high heat risk areas. • In 2025, London also experienced its highest number of wildfires since the extreme heat of 2022. Firefighters attended around 88 wildfires across the capital during June, July and August, with 122 wildfire incidents recorded by the end of August. This is double the number seen in 2023 and a 42 per cent increase in 2024. This trend highlights the growing risk from hot and dry conditions.

This week London has seen extreme heat - but in years to come we could experience two or three times more heatwaves each year. We need to act to protect our communities and strengthen our city’s resilience to rising heat. That’s why today I launched London’s first heat plan.