C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Madrid
Bangkok
Freetown
Stockholm
Accra
Tokyo
Delhi NCT
New Orleans
New York City
Mexico City
Cape Town
Ekurhuleni
London
Chicago
Sydney
Kuala Lumpur
Yokohama
Oslo
Bogotá
Chengdu
Los Angeles
Tshwane
São Paulo
Quito
Casablanca
Fortaleza
Milan
Vancouver
Lisbon
Copenhagen
Ahmedabad
Chennai
Buenos Aires
Madrid
Bangkok
Freetown
Stockholm
Accra
Tokyo
Delhi NCT
New Orleans
New York City
Mexico City
Cape Town
Ekurhuleni
London
Chicago
Sydney
Kuala Lumpur
Yokohama
Oslo
Bogotá
Chengdu
Los Angeles
Tshwane
São Paulo
Quito
Casablanca
Fortaleza
Milan
Vancouver
Lisbon
Copenhagen
Ahmedabad
Chennai
Buenos Aires
Shanghai
Dalian
Lima
Seoul
Istanbul
Miami
Dakar
Rio de Janeiro
Paris
Hong Kong
Rotterdam
Ho Chi Minh City
Durban (eThekwini)
Amman
Singapore
Tel Aviv – Yafo
Medellín
Abidjan
Bengaluru
Boston
Barcelona
Beijing
Auckland
Athens
Dar es Salaam
Lagos
Quezon City
Guangzhou
Hanoi
Warsaw
Jakarta
Karachi
Portland
Shanghai
Dalian
Lima
Seoul
Istanbul
Miami
Dakar
Rio de Janeiro
Paris
Hong Kong
Rotterdam
Ho Chi Minh City
Durban (eThekwini)
Amman
Singapore
Tel Aviv – Yafo
Medellín
Abidjan
Bengaluru
Boston
Barcelona
Beijing
Auckland
Athens
Dar es Salaam
Lagos
Quezon City
Guangzhou
Hanoi
Warsaw
Jakarta
Karachi
Portland
Washington, DC
Houston
Amsterdam
Johannesburg
Curitiba
Berlin
Nanjing
Addis Ababa
Nairobi
Heidelberg
Montréal
Austin
Rome
San Francisco
Salvador
Seattle
Wuhan
Guadalajara
Mumbai
Dubai
Hangzhou
Phoenix
Melbourne
Shenzhen
Philadelphia
Dhaka (North & South)
Qingdao
Zhenjiang
Toronto
Fuzhou
Santiago
Washington, DC
Houston
Amsterdam
Johannesburg
Curitiba
Berlin
Nanjing
Addis Ababa
Nairobi
Heidelberg
Montréal
Austin
Rome
San Francisco
Salvador
Seattle
Wuhan
Guadalajara
Mumbai
Dubai
Hangzhou
Phoenix
Melbourne
Shenzhen
Philadelphia
Dhaka (North & South)
Qingdao
Zhenjiang
Toronto
Fuzhou
Santiago
C40 has
97
member cities
Making up more than
22%
of the global economy1
Accelerator Reports
Latest Reports Now Available
Since 2017, 74 forward-thinking C40 cities have been driving transformative action in critical sectors through C40’s High-Impact Accelerators.
In the latest Accelerator Reports, we celebrate the progress and impact of cities’ climate actions.
Latest News
October 2, 2025
September 30, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.