I'm a scientist, not a theologian. I don't know if there is a God or not. Religion requires certainty.

Let's make hay while it lasts.

I wouldn't be against them (large wind turbines) if they actually worked.

We'd never have got a chance to go outside and look at the earth if it hadn't been for space exploration and NASA.

Those who fail to see that population growth and climate change are two sides of the same coin are either ignorant or hiding from the truth. These two huge environmental problems are inseparable and to discuss one while ignoring the other is irrational.

The world has not warmed up very much since the millennium. Twelve years is a reasonable time... it (the temperature) has stayed almost constant, whereas it should have been rising - carbon dioxide is rising, no question about that.

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.