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