C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Seattle
Abidjan
Hangzhou
Montréal
Hong Kong
New Orleans
Guangzhou
Barcelona
Philadelphia
Yokohama
Wuhan
Houston
New York City
Berlin
Phoenix
Copenhagen
Guadalajara
Austin
Nairobi
Los Angeles
Curitiba
Istanbul
Durban (eThekwini)
Rome
Salvador
Fuzhou
Tokyo
Dubai
Lisbon
Lima
Quito
Chennai
Melbourne
Seattle
Abidjan
Hangzhou
Montréal
Hong Kong
New Orleans
Guangzhou
Barcelona
Philadelphia
Yokohama
Wuhan
Houston
New York City
Berlin
Phoenix
Copenhagen
Guadalajara
Austin
Nairobi
Los Angeles
Curitiba
Istanbul
Durban (eThekwini)
Rome
Salvador
Fuzhou
Tokyo
Dubai
Lisbon
Lima
Quito
Chennai
Melbourne
Warsaw
Cape Town
Shanghai
Nanjing
Karachi
Dalian
Mumbai
Lagos
Quezon City
Vancouver
Shenzhen
Athens
Addis Ababa
Zhenjiang
Oslo
Boston
Bengaluru
Ekurhuleni
Madrid
Qingdao
Freetown
Casablanca
Bangkok
Stockholm
Chengdu
Medellín
Jakarta
Tel Aviv – Yafo
Amman
Toronto
Dar es Salaam
Seoul
Beijing
Warsaw
Cape Town
Shanghai
Nanjing
Karachi
Dalian
Mumbai
Lagos
Quezon City
Vancouver
Shenzhen
Athens
Addis Ababa
Zhenjiang
Oslo
Boston
Bengaluru
Ekurhuleni
Madrid
Qingdao
Freetown
Casablanca
Bangkok
Stockholm
Chengdu
Medellín
Jakarta
Tel Aviv – Yafo
Amman
Toronto
Dar es Salaam
Seoul
Beijing
Johannesburg
Bogotá
Ahmedabad
Delhi NCT
London
Accra
Miami
Portland
San Francisco
Tshwane
Heidelberg
Washington, DC
Milan
Santiago
Ho Chi Minh City
Auckland
Rio de Janeiro
Kuala Lumpur
Hanoi
Fortaleza
Dhaka (North & South)
Singapore
Mexico City
Buenos Aires
Dakar
São Paulo
Paris
Amsterdam
Chicago
Rotterdam
Sydney
Johannesburg
Bogotá
Ahmedabad
Delhi NCT
London
Accra
Miami
Portland
San Francisco
Tshwane
Heidelberg
Washington, DC
Milan
Santiago
Ho Chi Minh City
Auckland
Rio de Janeiro
Kuala Lumpur
Hanoi
Fortaleza
Dhaka (North & South)
Singapore
Mexico City
Buenos Aires
Dakar
São Paulo
Paris
Amsterdam
Chicago
Rotterdam
Sydney
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
July 23, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.