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