C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
San Francisco
Montréal
Paris
Amman
Ekurhuleni
Nanjing
Houston
Singapore
São Paulo
Abidjan
Zhenjiang
Bangkok
Karachi
Bogotá
Quito
Medellín
Santiago
Vancouver
Tokyo
Rotterdam
Sydney
Barcelona
Wuhan
Mumbai
Casablanca
Hangzhou
Ahmedabad
Rio de Janeiro
Philadelphia
Lima
Chennai
Hong Kong
Qingdao
San Francisco
Montréal
Paris
Amman
Ekurhuleni
Nanjing
Houston
Singapore
São Paulo
Abidjan
Zhenjiang
Bangkok
Karachi
Bogotá
Quito
Medellín
Santiago
Vancouver
Tokyo
Rotterdam
Sydney
Barcelona
Wuhan
Mumbai
Casablanca
Hangzhou
Ahmedabad
Rio de Janeiro
Philadelphia
Lima
Chennai
Hong Kong
Qingdao
Lisbon
Durban (eThekwini)
Portland
Cape Town
New York City
Istanbul
Berlin
Nairobi
London
Dar es Salaam
Seattle
Beijing
Bengaluru
Delhi NCT
Heidelberg
Mexico City
Dhaka (North & South)
Miami
Jakarta
Lagos
Johannesburg
Guangzhou
Melbourne
Buenos Aires
Madrid
New Orleans
Yokohama
Chengdu
Hanoi
Auckland
Rome
Milan
Tel Aviv – Yafo
Lisbon
Durban (eThekwini)
Portland
Cape Town
New York City
Istanbul
Berlin
Nairobi
London
Dar es Salaam
Seattle
Beijing
Bengaluru
Delhi NCT
Heidelberg
Mexico City
Dhaka (North & South)
Miami
Jakarta
Lagos
Johannesburg
Guangzhou
Melbourne
Buenos Aires
Madrid
New Orleans
Yokohama
Chengdu
Hanoi
Auckland
Rome
Milan
Tel Aviv – Yafo
Shenzhen
Ho Chi Minh City
Washington, DC
Phoenix
Addis Ababa
Shanghai
Stockholm
Warsaw
Toronto
Quezon City
Oslo
Guadalajara
Amsterdam
Austin
Dalian
Tshwane
Chicago
Curitiba
Kuala Lumpur
Dakar
Freetown
Seoul
Salvador
Accra
Fuzhou
Athens
Los Angeles
Dubai
Boston
Copenhagen
Fortaleza
Shenzhen
Ho Chi Minh City
Washington, DC
Phoenix
Addis Ababa
Shanghai
Stockholm
Warsaw
Toronto
Quezon City
Oslo
Guadalajara
Amsterdam
Austin
Dalian
Tshwane
Chicago
Curitiba
Kuala Lumpur
Dakar
Freetown
Seoul
Salvador
Accra
Fuzhou
Athens
Los Angeles
Dubai
Boston
Copenhagen
Fortaleza
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 17, 2025
October 17, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.