The World is Watching Cities, Now More than Ever

C40 is recognised as the leading global network of cities committed to addressing climate change in order to improve the health of our people, our cities, and our planet. 

What We're Working On

Our mayors are committed to taking bold climate action that will make their cities more inclusive and resilient.

Watch our mini documentary – nominated for a 2017 Global Sustainability Film Award to be announced at BAFTA – highlighting the work of six leading cities: Bogotá, Cape Town, New York City, Paris, Portland and Seoul. Thank you to Citi Foundation for their generous support of this project. 

From the Office of the Chair

C40 Chair and Mayor of Paris Anne Hidalgo is C40's global ambassador for cities. Follow along as we track Mayor Hidalgo and other Vice Chairs of C40 as they help shape our future.