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