C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Amman
Guangzhou
Seattle
Austin
Singapore
Houston
Fuzhou
Curitiba
Chengdu
Kuala Lumpur
Guadalajara
Madrid
Bogotá
Chennai
Ekurhuleni
São Paulo
Dakar
Salvador
Ho Chi Minh City
Bengaluru
Auckland
Casablanca
Lisbon
San Francisco
Portland
Milan
Yokohama
Hangzhou
Mexico City
Dhaka (North & South)
New York City
Cape Town
Seoul
Amman
Guangzhou
Seattle
Austin
Singapore
Houston
Fuzhou
Curitiba
Chengdu
Kuala Lumpur
Guadalajara
Madrid
Bogotá
Chennai
Ekurhuleni
São Paulo
Dakar
Salvador
Ho Chi Minh City
Bengaluru
Auckland
Casablanca
Lisbon
San Francisco
Portland
Milan
Yokohama
Hangzhou
Mexico City
Dhaka (North & South)
New York City
Cape Town
Seoul
Sydney
Delhi NCT
Rotterdam
Fortaleza
Warsaw
Jakarta
Melbourne
Vancouver
Qingdao
Tokyo
Barcelona
Los Angeles
Addis Ababa
Rome
Tel Aviv – Yafo
Montréal
London
Athens
Nairobi
Dubai
Buenos Aires
Santiago
Stockholm
Lagos
Chicago
Abidjan
Washington, DC
Paris
Heidelberg
Oslo
Hong Kong
Wuhan
Philadelphia
Sydney
Delhi NCT
Rotterdam
Fortaleza
Warsaw
Jakarta
Melbourne
Vancouver
Qingdao
Tokyo
Barcelona
Los Angeles
Addis Ababa
Rome
Tel Aviv – Yafo
Montréal
London
Athens
Nairobi
Dubai
Buenos Aires
Santiago
Stockholm
Lagos
Chicago
Abidjan
Washington, DC
Paris
Heidelberg
Oslo
Hong Kong
Wuhan
Philadelphia
Hanoi
Medellín
Rio de Janeiro
Karachi
Shanghai
Quezon City
Durban (eThekwini)
Copenhagen
Toronto
Zhenjiang
Quito
Dalian
Shenzhen
Freetown
Berlin
Accra
Ahmedabad
Boston
Mumbai
Beijing
Nanjing
Tshwane
Lima
Bangkok
Phoenix
Amsterdam
Johannesburg
Istanbul
Dar es Salaam
Miami
New Orleans
Hanoi
Medellín
Rio de Janeiro
Karachi
Shanghai
Quezon City
Durban (eThekwini)
Copenhagen
Toronto
Zhenjiang
Quito
Dalian
Shenzhen
Freetown
Berlin
Accra
Ahmedabad
Boston
Mumbai
Beijing
Nanjing
Tshwane
Lima
Bangkok
Phoenix
Amsterdam
Johannesburg
Istanbul
Dar es Salaam
Miami
New Orleans
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
June 24, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.