C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
New Orleans
Ahmedabad
Jakarta
Sydney
Lima
Rio de Janeiro
Miami
Seattle
Dar es Salaam
Phoenix
Rotterdam
Boston
Austin
Houston
Hangzhou
New York City
San Francisco
Quito
Accra
Medellín
Chengdu
Abidjan
Chicago
Berlin
Copenhagen
Fuzhou
Shanghai
Cape Town
Johannesburg
Shenzhen
Dhaka (North & South)
Kuala Lumpur
Seoul
New Orleans
Ahmedabad
Jakarta
Sydney
Lima
Rio de Janeiro
Miami
Seattle
Dar es Salaam
Phoenix
Rotterdam
Boston
Austin
Houston
Hangzhou
New York City
San Francisco
Quito
Accra
Medellín
Chengdu
Abidjan
Chicago
Berlin
Copenhagen
Fuzhou
Shanghai
Cape Town
Johannesburg
Shenzhen
Dhaka (North & South)
Kuala Lumpur
Seoul
Warsaw
Guangzhou
Lisbon
London
Portland
Rome
Dalian
Tel Aviv – Yafo
Buenos Aires
Lagos
Curitiba
Hong Kong
Amsterdam
Wuhan
Nairobi
Bangkok
Karachi
Tshwane
Singapore
Nanjing
Chennai
Athens
Mexico City
Philadelphia
Auckland
Beijing
Milan
Dakar
Freetown
Santiago
Bengaluru
Washington, DC
Zhenjiang
Warsaw
Guangzhou
Lisbon
London
Portland
Rome
Dalian
Tel Aviv – Yafo
Buenos Aires
Lagos
Curitiba
Hong Kong
Amsterdam
Wuhan
Nairobi
Bangkok
Karachi
Tshwane
Singapore
Nanjing
Chennai
Athens
Mexico City
Philadelphia
Auckland
Beijing
Milan
Dakar
Freetown
Santiago
Bengaluru
Washington, DC
Zhenjiang
Heidelberg
Durban (eThekwini)
Stockholm
Ho Chi Minh City
Amman
Toronto
Hanoi
Yokohama
Bogotá
Vancouver
Addis Ababa
Salvador
Paris
Delhi NCT
Dubai
Barcelona
Montréal
Guadalajara
Casablanca
Qingdao
Los Angeles
Istanbul
Quezon City
Mumbai
Ekurhuleni
Melbourne
Tokyo
São Paulo
Madrid
Oslo
Fortaleza
Heidelberg
Durban (eThekwini)
Stockholm
Ho Chi Minh City
Amman
Toronto
Hanoi
Yokohama
Bogotá
Vancouver
Addis Ababa
Salvador
Paris
Delhi NCT
Dubai
Barcelona
Montréal
Guadalajara
Casablanca
Qingdao
Los Angeles
Istanbul
Quezon City
Mumbai
Ekurhuleni
Melbourne
Tokyo
São Paulo
Madrid
Oslo
Fortaleza
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
October 9, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.