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