C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Tokyo
London
Heidelberg
Zhenjiang
Guangzhou
Singapore
Quito
Casablanca
Vancouver
New Orleans
Paris
Sydney
Boston
Athens
Copenhagen
Seoul
San Francisco
Jakarta
Montréal
Istanbul
Madrid
Ekurhuleni
Yokohama
Durban (eThekwini)
Portland
Qingdao
Wuhan
Lagos
Abidjan
Shanghai
Lisbon
Warsaw
Tel Aviv – Yafo
Tokyo
London
Heidelberg
Zhenjiang
Guangzhou
Singapore
Quito
Casablanca
Vancouver
New Orleans
Paris
Sydney
Boston
Athens
Copenhagen
Seoul
San Francisco
Jakarta
Montréal
Istanbul
Madrid
Ekurhuleni
Yokohama
Durban (eThekwini)
Portland
Qingdao
Wuhan
Lagos
Abidjan
Shanghai
Lisbon
Warsaw
Tel Aviv – Yafo
Shenzhen
Dakar
Oslo
Addis Ababa
Chengdu
Seattle
Chicago
Bogotá
Amman
Freetown
Houston
Melbourne
Beijing
Philadelphia
Nanjing
Cape Town
Milan
Austin
Lima
Accra
Barcelona
Nairobi
Toronto
Rio de Janeiro
Fuzhou
Guadalajara
New York City
Dhaka (North & South)
Los Angeles
São Paulo
Delhi NCT
Medellín
Miami
Shenzhen
Dakar
Oslo
Addis Ababa
Chengdu
Seattle
Chicago
Bogotá
Amman
Freetown
Houston
Melbourne
Beijing
Philadelphia
Nanjing
Cape Town
Milan
Austin
Lima
Accra
Barcelona
Nairobi
Toronto
Rio de Janeiro
Fuzhou
Guadalajara
New York City
Dhaka (North & South)
Los Angeles
São Paulo
Delhi NCT
Medellín
Miami
Chennai
Buenos Aires
Dalian
Rotterdam
Auckland
Fortaleza
Berlin
Rome
Karachi
Bangkok
Quezon City
Dubai
Curitiba
Salvador
Bengaluru
Santiago
Washington, DC
Kuala Lumpur
Amsterdam
Ahmedabad
Hangzhou
Ho Chi Minh City
Johannesburg
Stockholm
Mumbai
Phoenix
Dar es Salaam
Hanoi
Hong Kong
Tshwane
Mexico City
Chennai
Buenos Aires
Dalian
Rotterdam
Auckland
Fortaleza
Berlin
Rome
Karachi
Bangkok
Quezon City
Dubai
Curitiba
Salvador
Bengaluru
Santiago
Washington, DC
Kuala Lumpur
Amsterdam
Ahmedabad
Hangzhou
Ho Chi Minh City
Johannesburg
Stockholm
Mumbai
Phoenix
Dar es Salaam
Hanoi
Hong Kong
Tshwane
Mexico City
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
June 23, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.