C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Paris
Dakar
Shanghai
Tokyo
Casablanca
Istanbul
Stockholm
Qingdao
Mexico City
Athens
Dubai
Vancouver
Salvador
Tshwane
Yokohama
Guadalajara
Ekurhuleni
New Orleans
Lisbon
Santiago
Dhaka (North & South)
Ho Chi Minh City
Miami
São Paulo
Bangkok
Amsterdam
Barcelona
Toronto
Rio de Janeiro
Boston
Portland
Austin
Chengdu
Paris
Dakar
Shanghai
Tokyo
Casablanca
Istanbul
Stockholm
Qingdao
Mexico City
Athens
Dubai
Vancouver
Salvador
Tshwane
Yokohama
Guadalajara
Ekurhuleni
New Orleans
Lisbon
Santiago
Dhaka (North & South)
Ho Chi Minh City
Miami
São Paulo
Bangkok
Amsterdam
Barcelona
Toronto
Rio de Janeiro
Boston
Portland
Austin
Chengdu
Beijing
Mumbai
Copenhagen
Kuala Lumpur
Melbourne
Karachi
Shenzhen
Houston
Hanoi
Curitiba
Accra
Washington, DC
Tel Aviv – Yafo
Berlin
Amman
Durban (eThekwini)
Bogotá
London
Bengaluru
San Francisco
Chicago
Buenos Aires
Dalian
Hangzhou
Heidelberg
Singapore
Philadelphia
Milan
Los Angeles
Nairobi
Hong Kong
Dar es Salaam
Seattle
Beijing
Mumbai
Copenhagen
Kuala Lumpur
Melbourne
Karachi
Shenzhen
Houston
Hanoi
Curitiba
Accra
Washington, DC
Tel Aviv – Yafo
Berlin
Amman
Durban (eThekwini)
Bogotá
London
Bengaluru
San Francisco
Chicago
Buenos Aires
Dalian
Hangzhou
Heidelberg
Singapore
Philadelphia
Milan
Los Angeles
Nairobi
Hong Kong
Dar es Salaam
Seattle
Addis Ababa
Warsaw
Nanjing
Oslo
Wuhan
Madrid
Quito
Guangzhou
Lagos
Rotterdam
Abidjan
Ahmedabad
New York City
Cape Town
Phoenix
Zhenjiang
Fortaleza
Montréal
Lima
Medellín
Chennai
Quezon City
Auckland
Johannesburg
Rome
Sydney
Jakarta
Freetown
Fuzhou
Delhi NCT
Seoul
Addis Ababa
Warsaw
Nanjing
Oslo
Wuhan
Madrid
Quito
Guangzhou
Lagos
Rotterdam
Abidjan
Ahmedabad
New York City
Cape Town
Phoenix
Zhenjiang
Fortaleza
Montréal
Lima
Medellín
Chennai
Quezon City
Auckland
Johannesburg
Rome
Sydney
Jakarta
Freetown
Fuzhou
Delhi NCT
Seoul
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 18, 2025
September 15, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.