The big threat to the planet is people: there are too many, doing too well economically and burning too much oil.

Perhaps the single most important thing that we can do to undo the harm we have done is to fix firmly in our minds the thought: the earth is alive.

Humans are too stupid to prevent climate change from radically impacting on our lives over the coming decades.

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.

Humans on the Earth behave in some ways like a pathogenic micro-organism, or like the cells of a tumor.

The world has not warmed up very much since the millennium.

Evolution is a tightly coupled dance, with life and the material environment as partners. From the dance emerges the entity Gaia.