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There is power in numbers; but targeted collaboration could be more transformative. Hong Kong, a C40 participant, knows this well: in two separate but equally significant achievements this month, the city has looked beyond its 1,104 square kilometres to engage in co-operative relationships that advance its sustainability agenda.

Chief of Government of the City of Buenos Aires, Mauricio Macri, on a "Better on Bike" bicycle C40 Cities are leading the way on establishing urban cycling infrastructure and programs. Indeed, when it comes to climate initiatives in the transport sector, this is where Cities are taking the most action.

C40 Chair, New York City Mayor Michael R. Bloomberg joined The Climate Group yesterday in launching Climate Week NYC, a program of meetings, demonstrations, lectures and exhibitions that harness the City’s will to address climate change through local action -- and global collaboration.

New York City has taken a major step forward in its plan to give residents access to thousands of bikes throughout the city, an emissions-free transportation solution that will be available 24 hours a day, 365 days a year.

Cities are home to more than half the global population and are engines of the global economy, representing innovation, creativity and entrepreneurship. Now, as global concern over the impacts and risks of climate change intensifies, cities are being recognized for their position at the vanguard of climate change action. Scientific American has devoted its September issue to cities and the future of green innovation in the world’s urban centers, exploring many of the solutions that the C40 is forging and supporting.