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