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