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.

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.

Governments, existing primarily to protect and enhance capitalism, maintain their power through the use of technologies that control the populace - by bread or circuses, by war or schooling, by armies and police, all of which are enabled and empowered by technology. That is what we might call the stick part of capitalism, while the riches-for-the-few is the carrot.

My analysis, especially of the computer revolution, always comes back to capitalism. It's that economic system that has led to Western civilization's willingness to enslave ourselves to machines - because some people benefit enormously from it, while the costs are borne by other people and the planet.

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.

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.

It's from love and knowledge of nature that any sensible understanding must come. Technology is essentially antagonistic to nature - that in fact is why it's created, to do something to or with nature that wasn't there before, that wasn't natural.