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