We remember Adam Smith for his stunning intuition of the invisible
guiding hand that somehow enables rampant self interest to evolve for
the common good. Two hundred years later we face a similar paradox. We
know that the Earth is a benign and comfortable place for life and has
been so for most of its history, so how have selfish genes allowed the
evolution of so altruistic a planet? It is easy now to see how
Darwinian natural selection leads to the evolution of fit organisms but
how can the common good for all life also evolve by natural selection?