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