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