Some of my friends like to keep science and religion together, but I certainly like to keep them separate.

One factor that has remained constant through all the twists and turns of the history of physical science is the decisive importance of the mathematical imagination.

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.

The key to having an interesting life is to always say "yes" to anything crazy.

The whole point of science is that most of it is uncertain. That's why science is exciting--because we don't know. Science is all about things we don't understand. The public, of course, imagines science is just a set of facts. But it's not. Science is a process of exploring, which is always partial. We explore, and we find out things that we understand. We find out things we thought we understood were wrong. That's how it makes progress.

Vegetation is really controlling what happens...whereas the emphasis in the climate models has always been on the atmosphere.

The reason why new concepts in any branch of science are hard to grasp is always the same; contemporary scientists try to picture the new concept in terms of ideas which existed before.