That is certainly the point: when the human species was born, on the African savanna, life was pretty good; we could live in harmony with the rest of nature, and that's what I've been calling Eden. The only technologies that humans devised for some 2 million years were fire and the hand ax. That's all. Eden didn't need anything more

When I speak of knowledge of nature, I do not mean industrial science, which argues that nature is inert and can be understood only to enable humans to manipulate it. I mean that sense of nature that Aldo Leopold had in mind when he said, "A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community, wrong when it tends otherwise.

I'm convinced that the catastrophes of the next two decades will be so vast as to bring about a world where life, if it survives, will be far simpler - and the technologies, too. Then we will have come full circle to something like life on the savanna.

So the technology that does the least alteration of nature, the least harm to other species and systems, and provides the greatest intimacy of human with nature, is the best. We could make a scale with that in mind, and judge any technology by its place on that scale: speech and eyeglasses, say, would rank low; nuclear bombs and coal plants, high.

I want to leave my country without leaving my home.

That is the onslaught. It has been going on a long time, I argue, but in the 20th century humans have certainly perfected it, extending domination to every single corner of the earth and our Homo sapiens population to more than 6 billion - until no place is untouched by despoliation.

Everyone is shy - it is the inborn modesty that makes us able to live in harmony with other creatures and our fellows. Achievement comes not by denying shyness but, occasionally, by setting it aside and letting pride and perspiration come first.