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