President Obama delivers remarks at COP21 in Paris on the global community's need to address the threat of climate change. November 30, 2015.

The World is Watching Cities, Now More than Ever
COP21 brought cities into the spotlight. C40 is proud to help shine that light a little brighter. Because cities and mayors are acting now, and we're right beside them as they become necessary leaders in this vital cause.Watch the mayors of Bogotá, C

“If we want to leave our children, grandchildren and future generations a healthy planet, we’ve got to respond now to the challenge of climate change. “ – Robert Redford. From every part of our world, in our own way, we can do something to act on climate. But we need our world leaders to do the s