C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Freetown
Shenzhen
Heidelberg
Dakar
Toronto
London
Amsterdam
Medellín
Quezon City
Shanghai
Dhaka (North & South)
Mumbai
Quito
Philadelphia
Barcelona
Fuzhou
Guadalajara
Lagos
Mexico City
Wuhan
Tshwane
Delhi NCT
Amman
Ekurhuleni
Addis Ababa
San Francisco
New Orleans
Johannesburg
Paris
Qingdao
Chengdu
Rome
Hanoi
Freetown
Shenzhen
Heidelberg
Dakar
Toronto
London
Amsterdam
Medellín
Quezon City
Shanghai
Dhaka (North & South)
Mumbai
Quito
Philadelphia
Barcelona
Fuzhou
Guadalajara
Lagos
Mexico City
Wuhan
Tshwane
Delhi NCT
Amman
Ekurhuleni
Addis Ababa
San Francisco
New Orleans
Johannesburg
Paris
Qingdao
Chengdu
Rome
Hanoi
Rotterdam
Washington, DC
Ahmedabad
Miami
Singapore
Casablanca
Austin
Nanjing
Cape Town
Auckland
Chennai
Buenos Aires
Bogotá
Fortaleza
Seattle
Seoul
Abidjan
Vancouver
Beijing
Rio de Janeiro
Montréal
Chicago
Houston
Tel Aviv – Yafo
Lima
Boston
São Paulo
Karachi
Ho Chi Minh City
Melbourne
Milan
Istanbul
Los Angeles
Rotterdam
Washington, DC
Ahmedabad
Miami
Singapore
Casablanca
Austin
Nanjing
Cape Town
Auckland
Chennai
Buenos Aires
Bogotá
Fortaleza
Seattle
Seoul
Abidjan
Vancouver
Beijing
Rio de Janeiro
Montréal
Chicago
Houston
Tel Aviv – Yafo
Lima
Boston
São Paulo
Karachi
Ho Chi Minh City
Melbourne
Milan
Istanbul
Los Angeles
Tokyo
Athens
Madrid
Dar es Salaam
Phoenix
Dubai
Warsaw
Portland
Nairobi
Kuala Lumpur
Santiago
Zhenjiang
Salvador
Dalian
Berlin
New York City
Bengaluru
Hangzhou
Durban (eThekwini)
Yokohama
Bangkok
Lisbon
Curitiba
Stockholm
Accra
Hong Kong
Guangzhou
Jakarta
Sydney
Copenhagen
Oslo
Tokyo
Athens
Madrid
Dar es Salaam
Phoenix
Dubai
Warsaw
Portland
Nairobi
Kuala Lumpur
Santiago
Zhenjiang
Salvador
Dalian
Berlin
New York City
Bengaluru
Hangzhou
Durban (eThekwini)
Yokohama
Bangkok
Lisbon
Curitiba
Stockholm
Accra
Hong Kong
Guangzhou
Jakarta
Sydney
Copenhagen
Oslo
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
July 23, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.