I have a feeling that climate change may be an issue as severe as a war. It may be necessary to put democracy on hold for a while.

The world has not warmed up very much since the millennium.

The climate is doing its usual tricks. There's nothing much really happening yet. We were supposed to be halfway toward a frying world now.

I'm not a pessimist, even though I do think awful things are going to happen.

Our future is like that of the passengers on a small pleasure boat sailing quietly above the Niagara Falls, not knowing that the engines are about to fail.

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.

We live at a time when emotions and feelings count more than truth, and there is a vast ignorance of science