Cabbies in particular seem to like discussing the fate the Earth.

We get so little news about the developing world that we often forget that there are literally millions of people out there struggling to change things to be fairer, freer, more democratic, less corrupt.

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

I think we're going to start to see a new model of civic advocacy where people get together once in a while to protest, but it's more about an ongoing, sustained engagement in issues, networks and communities about which people care.

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

If mass media, social isolation in the suburbs, alienating workplaces and long car commutes create a bunker mentality, the Internet does the opposite.

I think there's a gigantic generation gap in terms of how people understand the Internet and how much they think technology is an important factor in social change.