Every participating city will present best practices in order to exchange experiences and inspiration for developing new programs to tackle climate change.

So far, 45 cities have confirmed the participation, including São Paulo, host of the 2011 C40 edition.

See below the completed list of confirmed cities:

Addis Ababa (Ethiopia)
Amsterdan (Holland)
Athens (Greece)
Austin (USA)
Bancoc (Thailand)
Barcelona (Spain)
Basel (Switzerland)
Berlim (Germany)
Bogota (Colombia)
Buenos Aires (Argentina)
Caracas (Venezuela)
Changwon (South Korea)
Copenhagen (Denmark)
Curitiba (Brazil)
Délhi (India)
Philadelphia (USA)
Heidelberg (Germany)
Ho Chi Minh (Vietnam)
Hong Kong (China)
Houston (USA)
Jacarta (Indonesia)
Karachi (Pakistan)
Lagos (Nigeria)
Lima (Peru)
London (England)
Los Angeles (USA)
Madrid (Spain)
Melbourne (Australia)
Moscow (Russia)
New Orleans (USA)
New York (USA)
Paris (France)
Portland (USA)
Rio de Janeiro (Brazil)
Rome (Italy)
Rotterdam (Holland)
Santiago (Chile)
San Francisco (USA)
Sao Paulo (Brazil)
Seatlle (USA)
Seoul (South Korea)
Sydney (Australia)
Toronto (Canada)
Warsaw (Poland)
Yokohama (Japan)