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