If someone could actually prove scientifically that there is such a thing as a supernatural force, it would be one of the greatest discoveries in the history of science. So the notion that somehow scientists are resisting it is ludicrous.

The students of biodiversity, the ones we most need in science today, have an enormous task ahead of molecular biology and the medical scientists. Studying model species is a great idea, but we need to combine that with biodiversity studies and have those properly supported because of the contribution they can make to conservation biology, to agrobiology, to the attainment of a sustainable world.

[P]rescientific people... could never guess the nature of physical reality beyond the tiny sphere attainable by unaided common sense. Nothing else ever worked, no exercise from myth, revelation, art, trance, or any other conceivable means; and notwithstanding the emotional satisfaction it gives, mysticism, the strongest prescientific probe in the unknown, has yielded zero.

The solutions like freezing zygotes, fertilized eggs, of all kinds of animals and so on, or keeping them in zoos and having arboreta where we have trees, all these things have been promoted. Even getting the complete genetic code of various fishes so we can let them pass away and then we'll pull them back. That is science fiction run amok.

If enough species are extinguished, will the ecosystems collapse, and will the extinction of most other species follow soon afterward? The only answer anyone can give is: possibly. By the time we find out, however, it might be too late. One planet, one experiment.

Sometimes a concept is baffling not because it is profound but because it is wrong.

It's obvious that the key problem facing humanity in the coming century is how to bring a better quality of life - for 8 billion or more people - without wrecking the environment entirely in the attempt.