In early history phobias might have provided the extra margin needed to insure survival... - Edward O. Wilson

Few will doubt that humankind has created a planet-sized problem for itself. No one wished it so, but we are the first species to become a geophysical force, altering Earth's climate, a role previously reserved for tectonics, sun flares, and glacial cycles. We are also the greatest destroyer of life since the ten-kilometer-wide meteorite that landed near Yucatan and ended the Age of Reptiles sixty-five million years ago. Through overpopulation we have put ourselves in danger of running out of food and water. So a very Faustian choice is upon us: whether to accept our corrosive and risky behavior as the unavoidable price of population and economic growth, or to take stock of ourselves and search for a new environmental ethic.

Primitive men are ecological analogs of lions, wolves, and hyenas... they have adopted pack hunting in the pursuit of big game. ...habitually slaughtering surplus prey, storing food, feeding solid food to their young, dividing labor, practicing cannibalism, and interacting aggressively with competing species. ...this way of life persisted for millions of years or longer and was abandoned in most societies only during the last few thousand years.

Piaget, who was originally trained as a biologist, views intellectual development as an interaction of an inherited genetic program with the environment. It is no coincidence that he calls this conception "genetic epistemology," in effect the study of the hereditary unfolding of understanding.