We're trying to run a 21st century society and economy with 19th century Darwinian, competitive, crude ideas.

There are a lot of people who don't contribute anything to consumption and production.

I was recently looking at what they can actually do to reduce consumption of petrol. It would be quite possible to build automobiles out of carbon fibre that would be just as strong, weigh 10 times less and consume 10 times less petrol.

Everything has to be done to build some sort of international democracy. We've seen only the tiniest beginnings of that.

This erosion of the middle class is happening all over the place. The opening of a wider gap between rich and poor is always accompanied by such a process.

The question is not only what is grown but what it's used for. There's not going to be a mass transformation of dietary habits in rich countries-on the contrary, the first thing people do when they become more prosperous is to buy more meat.

Now we are flying off into outer space, there is no clear curb on what can be done in the name of the economy.