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

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

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

When I listen to the public debates about climate change, I am impressed by the enormous gaps in our knowledge, the sparseness of our observations and the superficiality of our theories.

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.

We simply don't know yet what's going to happen to the carbon in the atmosphere.