C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Portland
Ekurhuleni
Singapore
Warsaw
Santiago
Chennai
Lisbon
Berlin
Seattle
Lagos
Chengdu
Tel Aviv – Yafo
Karachi
Cape Town
Guangzhou
Auckland
New York City
San Francisco
Hanoi
Rio de Janeiro
Lima
Amsterdam
Sydney
Johannesburg
Curitiba
Addis Ababa
Abidjan
Barcelona
Rome
Zhenjiang
Oslo
Bangkok
Houston
Portland
Ekurhuleni
Singapore
Warsaw
Santiago
Chennai
Lisbon
Berlin
Seattle
Lagos
Chengdu
Tel Aviv – Yafo
Karachi
Cape Town
Guangzhou
Auckland
New York City
San Francisco
Hanoi
Rio de Janeiro
Lima
Amsterdam
Sydney
Johannesburg
Curitiba
Addis Ababa
Abidjan
Barcelona
Rome
Zhenjiang
Oslo
Bangkok
Houston
Buenos Aires
Ahmedabad
Austin
Vancouver
Wuhan
Shenzhen
Melbourne
Jakarta
Philadelphia
Accra
Freetown
Dalian
Quito
Los Angeles
Salvador
Yokohama
Dhaka (North & South)
Hong Kong
Dakar
Tokyo
Kuala Lumpur
Paris
Durban (eThekwini)
Qingdao
São Paulo
Rotterdam
Shanghai
Dubai
Stockholm
Casablanca
Washington, DC
Boston
Bogotá
Buenos Aires
Ahmedabad
Austin
Vancouver
Wuhan
Shenzhen
Melbourne
Jakarta
Philadelphia
Accra
Freetown
Dalian
Quito
Los Angeles
Salvador
Yokohama
Dhaka (North & South)
Hong Kong
Dakar
Tokyo
Kuala Lumpur
Paris
Durban (eThekwini)
Qingdao
São Paulo
Rotterdam
Shanghai
Dubai
Stockholm
Casablanca
Washington, DC
Boston
Bogotá
Guadalajara
Toronto
Amman
Milan
Ho Chi Minh City
Heidelberg
New Orleans
Mexico City
Delhi NCT
Quezon City
Mumbai
Hangzhou
Montréal
Tshwane
Seoul
Fortaleza
London
Fuzhou
Phoenix
Nairobi
Beijing
Dar es Salaam
Nanjing
Miami
Chicago
Copenhagen
Athens
Istanbul
Madrid
Bengaluru
Medellín
Guadalajara
Toronto
Amman
Milan
Ho Chi Minh City
Heidelberg
New Orleans
Mexico City
Delhi NCT
Quezon City
Mumbai
Hangzhou
Montréal
Tshwane
Seoul
Fortaleza
London
Fuzhou
Phoenix
Nairobi
Beijing
Dar es Salaam
Nanjing
Miami
Chicago
Copenhagen
Athens
Istanbul
Madrid
Bengaluru
Medellín
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
October 9, 2025
October 2, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.