Humans on the Earth behave in some ways like a pathogenic micro-organism, or like the cells of a tumor.

The problem is we don't know what the climate is doing. We thought we knew 20 years ago. That led to some alarmist books - mine included - because it looked clear-cut, but it hasn't happened.

One pound of uranium is worth about 3 million pounds worth of coal or oil.

I've got personal views on the '60s. You can't have freedom without paying the price for it.

I suspect any worries about genetic engineering may be unnecessary. Genetic mutations have always happened naturally, anyway.

We need a more authoritative world...What's the alternative to democracy? There isn't one. But even the best democracies agree that when a major war approaches, democracy must be put on hold for the time being. I have a feeling that climate change may be an issue as severe as war. It may be necessary to put democracy on hold for a while.

All the modelling we do shows that the climate is poised on the jump up to a new hot state. It is accelerating so fast that you could say that we are already in it.