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