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