C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Wuhan
Kuala Lumpur
Chennai
Chengdu
Lisbon
Athens
Singapore
Johannesburg
Medellín
Toronto
Salvador
Hangzhou
Chicago
Guadalajara
Mumbai
Jakarta
Abidjan
Guangzhou
Amsterdam
Addis Ababa
Beijing
Hanoi
Ahmedabad
Curitiba
Rotterdam
Houston
Lagos
Santiago
Portland
Fortaleza
Rio de Janeiro
Shanghai
Seoul
Wuhan
Kuala Lumpur
Chennai
Chengdu
Lisbon
Athens
Singapore
Johannesburg
Medellín
Toronto
Salvador
Hangzhou
Chicago
Guadalajara
Mumbai
Jakarta
Abidjan
Guangzhou
Amsterdam
Addis Ababa
Beijing
Hanoi
Ahmedabad
Curitiba
Rotterdam
Houston
Lagos
Santiago
Portland
Fortaleza
Rio de Janeiro
Shanghai
Seoul
Dhaka (North & South)
Milan
Stockholm
Yokohama
New York City
Sydney
Melbourne
London
Vancouver
Miami
Dar es Salaam
Zhenjiang
Cape Town
Heidelberg
Phoenix
Fuzhou
Bangkok
Quezon City
Delhi NCT
Tokyo
Dalian
Karachi
Madrid
Berlin
Montréal
Mexico City
São Paulo
Shenzhen
Boston
Tel Aviv – Yafo
Ekurhuleni
Dakar
San Francisco
Dhaka (North & South)
Milan
Stockholm
Yokohama
New York City
Sydney
Melbourne
London
Vancouver
Miami
Dar es Salaam
Zhenjiang
Cape Town
Heidelberg
Phoenix
Fuzhou
Bangkok
Quezon City
Delhi NCT
Tokyo
Dalian
Karachi
Madrid
Berlin
Montréal
Mexico City
São Paulo
Shenzhen
Boston
Tel Aviv – Yafo
Ekurhuleni
Dakar
San Francisco
Hong Kong
Barcelona
Los Angeles
Nairobi
Warsaw
Tshwane
Auckland
Buenos Aires
Bengaluru
Amman
Washington, DC
Paris
Casablanca
Dubai
Philadelphia
New Orleans
Bogotá
Ho Chi Minh City
Durban (eThekwini)
Freetown
Lima
Austin
Seattle
Accra
Nanjing
Copenhagen
Qingdao
Rome
Quito
Istanbul
Oslo
Hong Kong
Barcelona
Los Angeles
Nairobi
Warsaw
Tshwane
Auckland
Buenos Aires
Bengaluru
Amman
Washington, DC
Paris
Casablanca
Dubai
Philadelphia
New Orleans
Bogotá
Ho Chi Minh City
Durban (eThekwini)
Freetown
Lima
Austin
Seattle
Accra
Nanjing
Copenhagen
Qingdao
Rome
Quito
Istanbul
Oslo
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
October 17, 2025
October 17, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.