To be a member of C40, cities must show measurable progress on each of these three missions: cutting emissions by halving fossil fuels by 2030, building resilience, and advancing justice in city climate …

Read through C40’s annual reports, where you’ll find results on emissions, clean air, green jobs, and resilience. Discover plenty of examples of how cities are beating targets, driving real progress, and …

Durante anos 20, C40 defendeu que as cidades são os catalisadores da ação climática. Nossos prefeitos ditam o ritmo da ação climática. Eles entregam resultados concretos e impulsionam …

Around the world, C40 mayors and the cities they lead are taking ambitious, collaborative and urgent climate action that aligns with science-backed targets. They work together across borders in order to …

Who We Are About C40 Leadership The C40 Co-Chairs Steering Committee C40 Board of Directors Funders & Partners

Nov 5, 2025 · C40 Cities' triennial climate action conference. The C40 World Mayors Summit 2025 takes place in Rio de Janeiro from 3–5 November.

C40 Une 97 cidades representando 920 milhões de pessoas para combater as alterações climáticas. As cidades são essenciais para agir na velocidade que a crise exige.

C40 is led by the elected C40 Chair, the Steering Committee and the Board of Directors.

Per gli anni 20, C40 ha promosso le città come catalizzatori per l'azione per il clima. I nostri sindaci dettano il ritmo dell'azione per il clima. Ottengono risultati concreti sul campo e guidano il …

C40 is a network of nearly 100 mayors of the world’s leading cities who are working to deliver the urgent action needed right now to confront the climate crisis and create a future where everyone, …