I'm not religious, but I put it that way because I feel so strongly. It's the one thing you do not ever do. You've got to have standards.

NASA will send up a big sun shade that will be in orbit between the earth and sun and deflect 2 or 3 percent of the sunshine back into space. It would be cheaper than the international space station.

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

A billion could live off the earth; 6 billion living as we do is far too many, and you run out of planet in no time.

Only nuclear power can now halt global warming.

There is little evidence that our individual intelligence has improved through recorded history.

Climate change now represents so urgent a threat to mankind that the only way to deal with it is by suspending democracy.