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