London Climate Action Week 2026

London Climate Action Week is an open platform convening climate action across the city, founded in 2019 and convened by the climate think tank E3G, with the 2026 edition running 20–28 June. Now in its eighth year, it spans nine days and is expected to bring together more than 75,000 people across over 750 events, from community gatherings in every borough and school events to ministerial roundtables in the City of London and major international conferences. It sits in the global climate calendar as a point where action happens between COP meetings, and forms part of a growing network of climate weeks linking London with New York, Shanghai, Bangkok, Sydney and Rio de Janeiro. Registering an event is free.