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

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

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.

If we gave up eating beef we would have roughly 20 to 30 times more land for food than we have now.

We are in a fool's climate, accidentally kept cool by smoke, and before this century is over billions of us will die and the few breeding pairs of people that survive will be in the Arctic where the climate remains tolerable.

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.

Perhaps the single most important thing that we can do to undo the harm we have done is to fix firmly in our minds the thought: the earth is alive.