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