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