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

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