A global network of mayors taking urgent action to confront the climate crisis and create a future where everyone can thrive.

© C40
Explore our cities
C40 has 97 member cities
Making up more than 25% of the global economy1
Comprised of 700+ million people2

C40 in action

Led by mayors around the globe, C40’s Agenda for a Green and Just Recovery outlines bold steps to deliver an equitable and sustainable recovery from the COVID-19 pandemic. 

Learn more about their work to create green jobs, invest in crucial public services, protect mass transit, support essential workers, and give public spaces back to people and nature.

UK: A young boy jumping into his mother's arms off a wooden play area.
© SolStock / Getty Images

Latest from the newsroom

January 28, 2022
Port of Los Angeles, Port of Shanghai, and C40 Cities announce partnership to create world’s first transpacific green shipping corridor between ports in the United States and China
Find out more
January 18, 2022
How London’s net zero plans are a win for all Londoners
Find out more
January 17, 2022
Mayors of Milan and Johannesburg elected to C40 Cities Steering Committee
Find out more
See all of our news

Sources:
1. 24% of global GDP (2019). Oxford Economics data, C40 modeling & World Bank for global GDP.
2. Oxford Economics data & C40 modelling, April 2021.

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