The notion of equilibrium is something I always disagree with when I read environmentalists. The ecosystem is never in equilibrium. If it were it would be dead.

The notion of equilibrium is something I always disagree with when I read environmentalists. The ecosystem is never in equilibrium. If it were it would be dead. If it reached a meta-stable state evolutionary change would halt. An icy comet circling way out beyond Neptune is an example of a system somewhat near equilibrium.