We are a global network of mayors driving the future of city climate action

96 cities representing 920 million people. 23% of the world?s economy.

We help cities move faster and go further on climate through:

- sector programmes that turn ambition into results
- accelerators that speed innovation and delivery
- research that powers evidence-based action
- finance pathways that unlock the resources to act
- global advocacy that shapes policy and raises ambition

Founded in 2005 by 18 pioneering cities, C40 now leads global progress on climate.