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