What is man? "Oh, what art thou man?" the poets of the good old days used to wonder. Man may be defined in an arbitrary number of ways, but to convey his most fundamental characteristic, he could be described with two words: too much. I'm too much, you're too much. There's five billion of us - an absurd, astonishing number, and still increasing? The earth's biosphere could possibly support a population of five million large mammals of this size, given their food requirements and the offal they produce, in order that they might exist in their own ecological niche, living as one species among many, without discriminating against the richness of other forms of life.