C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Tokyo
Guangzhou
Nanjing
Hong Kong
New York City
Seattle
Guadalajara
Berlin
Durban (eThekwini)
Madrid
Rome
Abidjan
Vancouver
Dalian
Fuzhou
São Paulo
Salvador
Stockholm
Philadelphia
Heidelberg
Oslo
Accra
Los Angeles
Lagos
Fortaleza
Shanghai
Copenhagen
Auckland
Qingdao
Toronto
Lisbon
Paris
Barcelona
Tokyo
Guangzhou
Nanjing
Hong Kong
New York City
Seattle
Guadalajara
Berlin
Durban (eThekwini)
Madrid
Rome
Abidjan
Vancouver
Dalian
Fuzhou
São Paulo
Salvador
Stockholm
Philadelphia
Heidelberg
Oslo
Accra
Los Angeles
Lagos
Fortaleza
Shanghai
Copenhagen
Auckland
Qingdao
Toronto
Lisbon
Paris
Barcelona
New Orleans
Beijing
Casablanca
Jakarta
Bangkok
Santiago
Quezon City
Nairobi
Amman
Boston
Karachi
Montréal
Washington, DC
Portland
Shenzhen
Yokohama
Dubai
Dar es Salaam
San Francisco
Cape Town
Sydney
Freetown
Bogotá
Wuhan
Seoul
Tel Aviv – Yafo
Delhi NCT
Chennai
Ahmedabad
Houston
Buenos Aires
Milan
Miami
New Orleans
Beijing
Casablanca
Jakarta
Bangkok
Santiago
Quezon City
Nairobi
Amman
Boston
Karachi
Montréal
Washington, DC
Portland
Shenzhen
Yokohama
Dubai
Dar es Salaam
San Francisco
Cape Town
Sydney
Freetown
Bogotá
Wuhan
Seoul
Tel Aviv – Yafo
Delhi NCT
Chennai
Ahmedabad
Houston
Buenos Aires
Milan
Miami
Phoenix
Mexico City
Chicago
Singapore
Addis Ababa
Melbourne
Lima
Rio de Janeiro
Kuala Lumpur
Mumbai
Quito
Ho Chi Minh City
Bengaluru
Athens
Hangzhou
Dakar
Ekurhuleni
Warsaw
Johannesburg
Dhaka (North & South)
London
Amsterdam
Medellín
Chengdu
Rotterdam
Istanbul
Zhenjiang
Curitiba
Austin
Hanoi
Tshwane
Phoenix
Mexico City
Chicago
Singapore
Addis Ababa
Melbourne
Lima
Rio de Janeiro
Kuala Lumpur
Mumbai
Quito
Ho Chi Minh City
Bengaluru
Athens
Hangzhou
Dakar
Ekurhuleni
Warsaw
Johannesburg
Dhaka (North & South)
London
Amsterdam
Medellín
Chengdu
Rotterdam
Istanbul
Zhenjiang
Curitiba
Austin
Hanoi
Tshwane
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 24, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.