C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Fuzhou
Medellín
Stockholm
Istanbul
Miami
Vancouver
Qingdao
São Paulo
Durban (eThekwini)
Salvador
Quito
Washington, DC
Ekurhuleni
Mumbai
Casablanca
Rome
Sydney
Seattle
Austin
Johannesburg
Singapore
Auckland
Chengdu
Lagos
Dar es Salaam
Ho Chi Minh City
Nairobi
Dhaka (North & South)
Bogotá
Chennai
Mexico City
Dubai
Copenhagen
Fuzhou
Medellín
Stockholm
Istanbul
Miami
Vancouver
Qingdao
São Paulo
Durban (eThekwini)
Salvador
Quito
Washington, DC
Ekurhuleni
Mumbai
Casablanca
Rome
Sydney
Seattle
Austin
Johannesburg
Singapore
Auckland
Chengdu
Lagos
Dar es Salaam
Ho Chi Minh City
Nairobi
Dhaka (North & South)
Bogotá
Chennai
Mexico City
Dubai
Copenhagen
Los Angeles
Seoul
Philadelphia
Quezon City
Freetown
Rio de Janeiro
Shanghai
Shenzhen
Melbourne
Guangzhou
Lima
Yokohama
Athens
Bangkok
Karachi
Wuhan
Madrid
Houston
Barcelona
Hangzhou
Curitiba
Accra
Bengaluru
Montréal
Beijing
Boston
Phoenix
Delhi NCT
New York City
Jakarta
Amman
Oslo
London
Los Angeles
Seoul
Philadelphia
Quezon City
Freetown
Rio de Janeiro
Shanghai
Shenzhen
Melbourne
Guangzhou
Lima
Yokohama
Athens
Bangkok
Karachi
Wuhan
Madrid
Houston
Barcelona
Hangzhou
Curitiba
Accra
Bengaluru
Montréal
Beijing
Boston
Phoenix
Delhi NCT
New York City
Jakarta
Amman
Oslo
London
Dalian
Warsaw
San Francisco
Buenos Aires
Tokyo
Milan
Cape Town
Abidjan
Lisbon
Berlin
Ahmedabad
Paris
Amsterdam
Toronto
Guadalajara
Portland
Zhenjiang
Nanjing
Chicago
Tel Aviv – Yafo
Santiago
Addis Ababa
Rotterdam
Hong Kong
Dakar
Tshwane
Kuala Lumpur
Hanoi
Fortaleza
New Orleans
Heidelberg
Dalian
Warsaw
San Francisco
Buenos Aires
Tokyo
Milan
Cape Town
Abidjan
Lisbon
Berlin
Ahmedabad
Paris
Amsterdam
Toronto
Guadalajara
Portland
Zhenjiang
Nanjing
Chicago
Tel Aviv – Yafo
Santiago
Addis Ababa
Rotterdam
Hong Kong
Dakar
Tshwane
Kuala Lumpur
Hanoi
Fortaleza
New Orleans
Heidelberg
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
July 23, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.