Carbon zero simply means that the emissions you are releasing either are zero or balance out to zero.

The denser places get, the lower the amount of energy people use to get around it.

In almost all city governments in America, the small group of people who don't want change are able to block change.

There’s more to being an environmentalist than occasionally signing an online petition and mailing your check to the Sierra Club. Really the most effective environmental actions you can take have to do with crafting your home and surroundings, your workplace decisions and your investment habits.

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

Cities are responsible for the vast majority of the creation of the economy. They're also places into which we pour the vast majority of resources, the vast majority of energy and the places where a huge percentage of the decisions about how systems are built and how products designed, etc., happen.

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.