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