It's not just enough to survive. We've got to make something better than what we've got.

There is no such thing as garbage, just useful stuff in the wrong place.

Copenhagen has done a remarkable job creating streets that are focused on bicycles and pedestrians.

Optimism is a political act. Those who benefit from the status quo are perfectly happy for us to think nothing is going to get any better. In fact, these days, cynicism is obedience.

Cities generate most of the global economy, and most of its energy use, resource demands and climate emissions. How we build cities over the next decades will largely determine whether we can deliver a bright green future.

We have to craft new political realities, not only in places like India, Afghanistan, Kenya, Pakistan, but here at home as well. Another world is possible.

Urban retrofitting: creating different sorts of spaces and uses out of places that are already there.