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