Anyway, here's the speech: http://longnow.org/seminars/02008/jun/27/dominant-animal-human-evolution-and-environment/
I have now had a chance to listen to the first hour of the speech. He really gives a good synopsis of the issues. The book will then give you detail on each of those things, with facts, examples, data, etc.
He does address the importance of understanding and knowledge, and he does address the main question Explodicle is asking. Listen to the speech.
Oh OK, I'll just watch that first. I was having trouble finding a PDF of The Dominant Animal, and the Mao quote on page 140 made me not want to pay for it. Maybe the speech will change my mind.