Let's make hay while it lasts.

All the modelling we do shows that the climate is poised on the jump up to a new hot state. It is accelerating so fast that you could say that we are already in it.

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.

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 Earth's population will be culled from today's 6.6 billion to as few as 500 million, with most of the survivors living in the far latitudes - Canada, Iceland, Scandinavia, the Arctic Basin.

It just so happens that the green religion is now taking over from the Christian religion. I don't think people have noticed that, but it's got all the sort of terms that religions use. The greens use guilt. That just shows how religious greens are. You can't win people round by saying they are guilty for putting (carbon dioxide) in the air.

An inefficient virus kills its host. A clever virus stays with it.