If you get someone who looks after himself and those around him, that's a deep ecologist. He can talk philosophy that I understand. People like that don't poison things, they don't ruin things, they don't lose soils, they don't build things they can't sustain.

There are only four things in all cleaners - whether it's shampoo, laundry detergent, whatever.You buy them in bulk and you mix them up properly, and they all work. It doesn't matter if they call the stuff ecologically friendly or have dolphins diving around on the label - it still has these damn four things in it. Anything else is just unnecessary additions to make it smell good or color it blue when it goes down the toilet.

Permaculture creates a cultivated ecology, which is designed to produce more human and animal food than is generally found in nature.

Anyone who ever studied mankind by listening to them was self-deluded. The first thing they should have done was to answer the question, "Can they report to you correctly on their behavior?" And the answer is, "No, the poor bastards cannot."

Once you've said to yourself, "But I'm not using my physics in my house," or "I'm not using my ecology in my garden, I've never applied it to what I do," it's like something physical moves inside your brain. Suddenly you say, "If I did apply what I know to how I live, that would be miraculous!" Then the whole thing unrolls like one great carpet. Undo one knot, and the whole thing just rolls downhill.

Few people today muck around in earth, and when on international flights, I often find I have the only decently dirty fingernails.

Compressed air can provide limitless amounts of clean energy using technology we have had for hundreds of years.