C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Oslo
Bogotá
Heidelberg
Fuzhou
Montréal
Santiago
Warsaw
Chennai
Rome
Rotterdam
Copenhagen
Lima
Delhi NCT
Singapore
Ekurhuleni
Bengaluru
Auckland
Paris
Barcelona
Quezon City
Stockholm
Philadelphia
Zhenjiang
Abidjan
Tokyo
Guangzhou
Curitiba
Madrid
São Paulo
Salvador
Amman
Freetown
Dhaka (North & South)
Oslo
Bogotá
Heidelberg
Fuzhou
Montréal
Santiago
Warsaw
Chennai
Rome
Rotterdam
Copenhagen
Lima
Delhi NCT
Singapore
Ekurhuleni
Bengaluru
Auckland
Paris
Barcelona
Quezon City
Stockholm
Philadelphia
Zhenjiang
Abidjan
Tokyo
Guangzhou
Curitiba
Madrid
São Paulo
Salvador
Amman
Freetown
Dhaka (North & South)
Hong Kong
Vancouver
Nanjing
Jakarta
Buenos Aires
Guadalajara
Fortaleza
Shenzhen
Kuala Lumpur
Portland
Los Angeles
San Francisco
Seoul
Phoenix
Ho Chi Minh City
Austin
Dakar
Yokohama
Dalian
Dubai
Bangkok
Washington, DC
Boston
New Orleans
Miami
Shanghai
Toronto
Seattle
Mumbai
Addis Ababa
Casablanca
Hangzhou
Melbourne
Hong Kong
Vancouver
Nanjing
Jakarta
Buenos Aires
Guadalajara
Fortaleza
Shenzhen
Kuala Lumpur
Portland
Los Angeles
San Francisco
Seoul
Phoenix
Ho Chi Minh City
Austin
Dakar
Yokohama
Dalian
Dubai
Bangkok
Washington, DC
Boston
New Orleans
Miami
Shanghai
Toronto
Seattle
Mumbai
Addis Ababa
Casablanca
Hangzhou
Melbourne
Durban (eThekwini)
Tel Aviv – Yafo
London
Istanbul
New York City
Tshwane
Qingdao
Hanoi
Rio de Janeiro
Johannesburg
Cape Town
Berlin
Quito
Dar es Salaam
Lagos
Ahmedabad
Mexico City
Sydney
Wuhan
Chicago
Houston
Karachi
Chengdu
Medellín
Milan
Beijing
Athens
Nairobi
Accra
Lisbon
Amsterdam
Durban (eThekwini)
Tel Aviv – Yafo
London
Istanbul
New York City
Tshwane
Qingdao
Hanoi
Rio de Janeiro
Johannesburg
Cape Town
Berlin
Quito
Dar es Salaam
Lagos
Ahmedabad
Mexico City
Sydney
Wuhan
Chicago
Houston
Karachi
Chengdu
Medellín
Milan
Beijing
Athens
Nairobi
Accra
Lisbon
Amsterdam
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
September 15, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.