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