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