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