You don't change the world by hiding in the woods, wearing a hair shirt, or buying indulgences in the form of 'Save the Earth' bumper stickers. You do it by articulating a vision for the future and pursuing it with all the ingenuity humanity can muster.

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.

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.

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

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

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

By looking at climate change as a clean energy generation problem, we're setting ourselves up not to solve it.