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