Unfortunately the global warming hysteria, as I see it, is driven by politics more than by science.

Just because you see pictures of glaciers falling into the ocean doesn't mean anything bad is happening. This is something that happens all the time. It's part of the natural cycle of things. We know from measurements that glaciers have been melting for 200 years at least.

The thing that makes me most optimistic is China and India - both of them doing well. It's amazing how much progress there's been in China, and also India. Those are the places that really matter - they're half of the world's population. They're the places where things are enormously better now than they were 50 years ago. And I don't see anything that's going to stop that.

Sometimes we talked about the nature of the human soul and about the Cosmic Unity of souls that I had believed in so firmly when I was 15 years old. My mother did not like the phrase Cosmic Unity. It was too pretentious. She preferred to call it a world soul.

The purpose of thinking about the future is not to predict it but to raise people's hopes.

In the history of science it has often happened that the majority was wrong and refused to listen to a minority that later turned out to be right.

We do not know how much of the environmental change is due to human activities and how much [is due] to long-term natural processes over which we have no control.