C40 Cities Climate Leadership Group

The C40 Cities Climate Leadership Group (C40) is a network of the world's megacities taking action to reduce greenhouse gas emissions. C40 harnesses the assets of member cities to address climate risks and impacts locally and globally.

C40 is composed of 83 member cities around the world. On November 26, the former C40 Chair, the 108th Mayor of New York City, Michael R. Bloomberg, was succeeded by the Mayor of Rio de Janeiro, Eduardo Paes. Mayor Bloomberg served as the elected leader of the organization from 2010 – 2013, he will stay on as the President of the C40 Board of Directors. Along with the Chair, a rotating steering committee of C40 mayors provides strategic direction and governance. Current steering committee members include: Tokyo, Hong Kong, Johannesburg, Jakarta, London, Seoul, Los Angeles, Copenhagen, Milan, Amman and Rio de Janeiro. With a focus on collaboration among member cities to excel climate actions, C40 has established eighteen networks across seven initiative areas with a global staff to support collaborative problem solving, promote the exchange of programs and policies developed by cities, and facilitate targeted peer-to-peer dialogue among city staff.