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