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