C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Phoenix
Dakar
Auckland
Guadalajara
Medellín
Hangzhou
Warsaw
Amman
Washington, DC
Sydney
Barcelona
São Paulo
Hanoi
Melbourne
Houston
Berlin
Rome
Bogotá
Tshwane
Ho Chi Minh City
Johannesburg
Montréal
Seoul
Lagos
Bangkok
Accra
Beijing
Karachi
Lima
Oslo
Miami
Addis Ababa
Nanjing
Phoenix
Dakar
Auckland
Guadalajara
Medellín
Hangzhou
Warsaw
Amman
Washington, DC
Sydney
Barcelona
São Paulo
Hanoi
Melbourne
Houston
Berlin
Rome
Bogotá
Tshwane
Ho Chi Minh City
Johannesburg
Montréal
Seoul
Lagos
Bangkok
Accra
Beijing
Karachi
Lima
Oslo
Miami
Addis Ababa
Nanjing
Istanbul
Nairobi
Heidelberg
Shanghai
Wuhan
Freetown
London
Quezon City
Singapore
Los Angeles
Toronto
Fuzhou
Zhenjiang
Boston
Madrid
Casablanca
New York City
Abidjan
Paris
Milan
Bengaluru
Fortaleza
Salvador
Mexico City
Quito
Kuala Lumpur
Dhaka (North & South)
Yokohama
Hong Kong
Athens
Dalian
Shenzhen
Tel Aviv – Yafo
Istanbul
Nairobi
Heidelberg
Shanghai
Wuhan
Freetown
London
Quezon City
Singapore
Los Angeles
Toronto
Fuzhou
Zhenjiang
Boston
Madrid
Casablanca
New York City
Abidjan
Paris
Milan
Bengaluru
Fortaleza
Salvador
Mexico City
Quito
Kuala Lumpur
Dhaka (North & South)
Yokohama
Hong Kong
Athens
Dalian
Shenzhen
Tel Aviv – Yafo
Qingdao
Chicago
Cape Town
Lisbon
Buenos Aires
Tokyo
Amsterdam
Jakarta
Santiago
Austin
Philadelphia
Stockholm
Copenhagen
Vancouver
Guangzhou
Chengdu
Ahmedabad
Durban (eThekwini)
Rio de Janeiro
Curitiba
Dar es Salaam
Chennai
Portland
Rotterdam
Delhi NCT
Mumbai
Dubai
New Orleans
San Francisco
Ekurhuleni
Seattle
Qingdao
Chicago
Cape Town
Lisbon
Buenos Aires
Tokyo
Amsterdam
Jakarta
Santiago
Austin
Philadelphia
Stockholm
Copenhagen
Vancouver
Guangzhou
Chengdu
Ahmedabad
Durban (eThekwini)
Rio de Janeiro
Curitiba
Dar es Salaam
Chennai
Portland
Rotterdam
Delhi NCT
Mumbai
Dubai
New Orleans
San Francisco
Ekurhuleni
Seattle
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 18, 2025
September 15, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.