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

Clean air and water, a diversity of animal and plant species, soil and mineral resources, and predictable weather are annuities that will pay dividends for as long as the human race survives – and may even extend our stay on Earth.

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.

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.

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

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