C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Seoul
Stockholm
Barcelona
Philadelphia
Quito
Kuala Lumpur
Durban (eThekwini)
Athens
Hangzhou
Jakarta
Houston
Dalian
Fortaleza
Rotterdam
Istanbul
Copenhagen
Hong Kong
Addis Ababa
Johannesburg
Paris
Ahmedabad
Amsterdam
Chicago
Santiago
Salvador
Shenzhen
Rome
Dhaka (North & South)
Toronto
Auckland
Miami
Guadalajara
Madrid
Seoul
Stockholm
Barcelona
Philadelphia
Quito
Kuala Lumpur
Durban (eThekwini)
Athens
Hangzhou
Jakarta
Houston
Dalian
Fortaleza
Rotterdam
Istanbul
Copenhagen
Hong Kong
Addis Ababa
Johannesburg
Paris
Ahmedabad
Amsterdam
Chicago
Santiago
Salvador
Shenzhen
Rome
Dhaka (North & South)
Toronto
Auckland
Miami
Guadalajara
Madrid
Oslo
Mumbai
Portland
Hanoi
Mexico City
Buenos Aires
Quezon City
Freetown
Abidjan
Wuhan
Ekurhuleni
Delhi NCT
Ho Chi Minh City
Shanghai
Accra
San Francisco
Phoenix
Nanjing
Dar es Salaam
Singapore
Cape Town
Heidelberg
Nairobi
Fuzhou
Berlin
London
Boston
Tshwane
Yokohama
Austin
Sydney
Casablanca
Bangkok
Oslo
Mumbai
Portland
Hanoi
Mexico City
Buenos Aires
Quezon City
Freetown
Abidjan
Wuhan
Ekurhuleni
Delhi NCT
Ho Chi Minh City
Shanghai
Accra
San Francisco
Phoenix
Nanjing
Dar es Salaam
Singapore
Cape Town
Heidelberg
Nairobi
Fuzhou
Berlin
London
Boston
Tshwane
Yokohama
Austin
Sydney
Casablanca
Bangkok
Bengaluru
Tel Aviv – Yafo
New York City
Lagos
Seattle
Bogotá
Guangzhou
Rio de Janeiro
Lima
Warsaw
New Orleans
Dubai
Qingdao
Karachi
Los Angeles
Lisbon
Beijing
Chennai
Tokyo
Milan
Curitiba
Melbourne
São Paulo
Chengdu
Vancouver
Montréal
Medellín
Amman
Dakar
Zhenjiang
Washington, DC
Bengaluru
Tel Aviv – Yafo
New York City
Lagos
Seattle
Bogotá
Guangzhou
Rio de Janeiro
Lima
Warsaw
New Orleans
Dubai
Qingdao
Karachi
Los Angeles
Lisbon
Beijing
Chennai
Tokyo
Milan
Curitiba
Melbourne
São Paulo
Chengdu
Vancouver
Montréal
Medellín
Amman
Dakar
Zhenjiang
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
September 18, 2025
September 15, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.