C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Montréal
Ekurhuleni
Tshwane
Boston
Guadalajara
Nairobi
Seattle
Lima
Dhaka (North & South)
Dakar
Shanghai
Casablanca
Bogotá
Freetown
Bengaluru
Yokohama
Paris
Bangkok
Rotterdam
Accra
Quito
Jakarta
Portland
Berlin
Oslo
Milan
Tel Aviv – Yafo
Karachi
Singapore
Chengdu
Durban (eThekwini)
Dubai
Abidjan
Montréal
Ekurhuleni
Tshwane
Boston
Guadalajara
Nairobi
Seattle
Lima
Dhaka (North & South)
Dakar
Shanghai
Casablanca
Bogotá
Freetown
Bengaluru
Yokohama
Paris
Bangkok
Rotterdam
Accra
Quito
Jakarta
Portland
Berlin
Oslo
Milan
Tel Aviv – Yafo
Karachi
Singapore
Chengdu
Durban (eThekwini)
Dubai
Abidjan
Nanjing
Amman
San Francisco
Athens
Johannesburg
Washington, DC
Tokyo
Melbourne
Kuala Lumpur
Los Angeles
Cape Town
Zhenjiang
Stockholm
New Orleans
Barcelona
Delhi NCT
Lagos
Miami
Fortaleza
Houston
Addis Ababa
Curitiba
Santiago
Ahmedabad
Sydney
Hong Kong
London
Austin
Warsaw
Istanbul
Lisbon
Phoenix
New York City
Nanjing
Amman
San Francisco
Athens
Johannesburg
Washington, DC
Tokyo
Melbourne
Kuala Lumpur
Los Angeles
Cape Town
Zhenjiang
Stockholm
New Orleans
Barcelona
Delhi NCT
Lagos
Miami
Fortaleza
Houston
Addis Ababa
Curitiba
Santiago
Ahmedabad
Sydney
Hong Kong
London
Austin
Warsaw
Istanbul
Lisbon
Phoenix
New York City
Rome
Chicago
Dalian
Mumbai
Salvador
Chennai
Quezon City
São Paulo
Beijing
Ho Chi Minh City
Vancouver
Auckland
Hanoi
Medellín
Mexico City
Dar es Salaam
Fuzhou
Hangzhou
Seoul
Rio de Janeiro
Shenzhen
Qingdao
Toronto
Copenhagen
Philadelphia
Heidelberg
Amsterdam
Buenos Aires
Guangzhou
Wuhan
Madrid
Rome
Chicago
Dalian
Mumbai
Salvador
Chennai
Quezon City
São Paulo
Beijing
Ho Chi Minh City
Vancouver
Auckland
Hanoi
Medellín
Mexico City
Dar es Salaam
Fuzhou
Hangzhou
Seoul
Rio de Janeiro
Shenzhen
Qingdao
Toronto
Copenhagen
Philadelphia
Heidelberg
Amsterdam
Buenos Aires
Guangzhou
Wuhan
Madrid
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
October 17, 2025
October 17, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.