Humans on the Earth behave in some ways like a pathogenic micro-organism, or like the cells of a tumor.
What we have lived through, the 20th century, has been like a great party. Adults now have had the best time humanity has ever had. Now the party is over and the Earth is reckoning up.
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.
We'd never have got a chance to go outside and look at the earth if it hadn't been for space exploration and NASA.
Life does more than adapt to the Earth. It changes the Earth to its own purposes.
Life clearly does more than adapt to the Earth. It changes the Earth to its own purposes. Evolution is a tightly coupled dance, with life and the material environment as partners. From the dance emerges the entity Gaia.