Science is not a collection of truths. It is a continuing exploration of mysteries.

No matter how far we go into the future, there will always be new things happening, new information coming in, new worlds to explore, a constantly expanding domain of life, consciousness, and memory.

Scepticism is as important for a good journalist as it is for a good scientist.

We cannot hope to either understand or to manage the carbon in the atmosphere unless we understand and manage the trees and the soil too.

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

Computer models of the climate....[are] a very dubious business if you don't have good inputs.

There is no doubt that parts of the world are getting warmer, but the warming is not global.