At least half of every city is wrong. From latitude 30 degrees to latitude 60, say, you've got to have the long axis of the house facing the sun. If the land is cut up into squares, that makes half of all houses wrong if they face the road. Even houses way in the country, and way off the road, face the bloody road. And from there, you just go wronger all the way.

We have to rethink how we're going to live on this earth - stop talking about the fact that we've got to have agriculture, we've got to have exports, because all that is the death of us.

Pollution is an unused resource.

The only ethical decision is to take responsibility for our own existence and that of our children.

Instead of physicists teaching physics, physicists should go home and see what physics applies to their home.

Say you're working for a big overseas aid organization. You can't leave home in a Mercedes Benz, travel 80 kilometers to work in a great concrete structure where there are diesel engines thundering in the basement just to keep it cool enough for you to work in, and plan mud huts for Africa! You can't get the mud huts right if you haven't got things right where you are. You've got to get things right, working for you, and then go and say what that is.

I can easily teach people to be gardeners, and from them, once they know how to garden, you'll get a philosopher.