C40 Cities: When local action meets global ambition
Behind every climate solution is a community and a city that dared to lead.
Lima
Casablanca
Copenhagen
Cape Town
Addis Ababa
Oslo
Athens
Berlin
Stockholm
Mexico City
São Paulo
Warsaw
Yokohama
Zhenjiang
Shenzhen
Kuala Lumpur
Seoul
Nanjing
Beijing
Fuzhou
Freetown
Bengaluru
Montréal
Ekurhuleni
Hangzhou
Seattle
New Orleans
Vancouver
Wuhan
Tokyo
Milan
Durban (eThekwini)
Guangzhou
Lima
Casablanca
Copenhagen
Cape Town
Addis Ababa
Oslo
Athens
Berlin
Stockholm
Mexico City
São Paulo
Warsaw
Yokohama
Zhenjiang
Shenzhen
Kuala Lumpur
Seoul
Nanjing
Beijing
Fuzhou
Freetown
Bengaluru
Montréal
Ekurhuleni
Hangzhou
Seattle
New Orleans
Vancouver
Wuhan
Tokyo
Milan
Durban (eThekwini)
Guangzhou
Istanbul
Singapore
Ho Chi Minh City
Dalian
Jakarta
Santiago
Tshwane
Dar es Salaam
Ahmedabad
Portland
Houston
Accra
Curitiba
Guadalajara
Fortaleza
Quito
Toronto
Chengdu
Auckland
Los Angeles
Karachi
Rotterdam
Nairobi
Bogotá
Abidjan
Barcelona
Sydney
Qingdao
Quezon City
Salvador
Medellín
San Francisco
Buenos Aires
Istanbul
Singapore
Ho Chi Minh City
Dalian
Jakarta
Santiago
Tshwane
Dar es Salaam
Ahmedabad
Portland
Houston
Accra
Curitiba
Guadalajara
Fortaleza
Quito
Toronto
Chengdu
Auckland
Los Angeles
Karachi
Rotterdam
Nairobi
Bogotá
Abidjan
Barcelona
Sydney
Qingdao
Quezon City
Salvador
Medellín
San Francisco
Buenos Aires
Dubai
Lisbon
Rome
Boston
Amman
Madrid
New York City
Hanoi
Mumbai
Chicago
Lagos
Chennai
Bangkok
Delhi NCT
Heidelberg
Paris
Dhaka (North & South)
London
Shanghai
Tel Aviv – Yafo
Hong Kong
Austin
Phoenix
Melbourne
Washington, DC
Dakar
Johannesburg
Amsterdam
Rio de Janeiro
Philadelphia
Miami
Dubai
Lisbon
Rome
Boston
Amman
Madrid
New York City
Hanoi
Mumbai
Chicago
Lagos
Chennai
Bangkok
Delhi NCT
Heidelberg
Paris
Dhaka (North & South)
London
Shanghai
Tel Aviv – Yafo
Hong Kong
Austin
Phoenix
Melbourne
Washington, DC
Dakar
Johannesburg
Amsterdam
Rio de Janeiro
Philadelphia
Miami
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
October 2, 2025
Sources:
1. Oxford Economics data + C40 modelling and World Bank for global GDP.