The essence of dramatic tragedy is not unhappiness. It resides in the solemnity of the remorseless working of things.

Ecological differentiation is the necessary condition for coexistence.

The social arrangements that produce responsibility are arrangements that create coercion, of some sort.

To say that we mutually agree to coercion is not to say that we are required to enjoy it, or even to pretend we enjoy it.

Every measured thing is part of a web of variables more richly interconnected than we know.

But as population became denser, the natural chemical and biological recycling processes became overloaded, calling for a redefinition of property rights.

The population problem has no technical solution; it requires a fundamental extension in morality.