[The natural world cleans water, pollinates plants and provides pharmaceuticals, among many other gifts.] Thirty trillion dollars worth of services, scot-free to humanity, every year.

We have to create a sustainable environment, worldwide, and we're not doing it. The best thing we can do with the rest of this century is aggressively acquire - and put aside - the richest natural reserves that we can, and then do our best to manage the needs and desires of the 11 billion people we expect to have by the end of the century. This is where biology is headed. For that reason, the sooner we get on with mapping biodiversity on Earth, the better off biology will be - not to mention the whole subject of saving it before we carelessly throw it away.

Ideas emerge when a part of the real or imagined world is studied for its own sake.

Of course, there is no reconciliation between the theory of evolution by natural selection and the traditional religious view of the origin of the human mind.

We should not knowingly allow any species or race to go extinct. And let us go beyond mere salvage to begin the restoration of natural environments, in order to enlarge wild populations and stanch the hemorrhaging of biological wealth. There can be no purpose more enspiriting than to begin the age of restoration, reweaving the wondrous diversity of life that still surrounds us.

Hands-on experience at the critical time, not systematic knowledge, is what counts in the making of a naturalist. Better to be an untutored savage for a while, not to know the names or anatomical detail. Better to spend stretches of time just searching and dreaming.

Science and religion are the two most powerful forces in the world. Having them at odds... is not productive.