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