The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

Saying the Tech Bloom is not commercially driven is like saying Mother Teresa had an interest in the poor.

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.

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

For most people, using the Internet broadens their sense of who 'we' is and actually ends up leaving us in a place of greater compassion and understanding. It leaves us more connected to a larger group of people and more at one with a lot more people in our community.

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

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