There are a few societies that show signs of having been very rational about the physics of construction and the physics of real life. Some of the old middle-Eastern societies had downdraft systems over whole cities, and passive, rapid-evaporation ice-making systems. They were rational people using good physical principles to make themselves comfortable without additional sources of energy.

We're only truly secure when we can look out our kitchen window and see our food growing and our friends working nearby.

Wealth is a deep understanding of the natural world.

I think it's pointless asking questions like "Will humanity survive?" It's purely up to people - if they want to, they can, if they don't want to, they won't.

The tragic reality is that very few sustainable systems are designed or applied by those who hold power, and the reason for this is obvious and simple: to let people arrange their own food, energy and shelter is to lose economic and political control over them. We should cease to look to power structures, hierarchical systems, or governments to help us, and devise ways to help ourselves.

Choose your friends from people who you like what they do - even though you mightn't like what they say.

The agriculture taught at colleges between 1930 and 1980 has caused more damage on the face of the Earth than any other factor.