By the end of this century, climate change will reduce the human population to a few breeding pairs surviving near the Arctic.

You mustn't take what I say as gospel because no one can second-guess the future.

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

We live at a time when emotions and feelings count more than truth, and there is a vast ignorance of science

We are in a fool's climate, accidentally kept cool by smoke, and before this century is over billions of us will die and the few breeding pairs of people that survive will be in the Arctic where the climate remains tolerable.

There is no clear distinction anywhere on the Earth's surface between living and nonliving matter. There is merely a hierarchy of intensity going from the 'material' environment of the rocks and the atmosphere to the living cells.

We are the intelligent elite among animal life on earth and whatever our mistakes, [Earth] needs us. This may seem an odd statement after all that I have said about the way 20th century humans became almost a planetary disease organism. But it has taken [Earth] 2.5 billion years to evolve an animal that can think and communicate its thoughts. If we become extinct she has little chance of evolving another.