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