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

Using the commons as a cesspool does not harm the general public under frontier conditions, because there is no public, the same behavior in a metropolis is unbearable.

The Universal Declaration of Human Rights describes the family as the natural and fundamental unit of society. It follows that any choice and decision with regard to the size of the family must irrevocably rest with the family itself, and cannot be made by anyone else.

You cannot do only one thing.

A coldly rationalist individualist can deny that he has any obligation to make sacrifices for the future.

Indeed, our particular concept of private property, which deters us from exhausting the positive resources of the earth, favors pollution.

Ecological differentiation is the necessary condition for coexistence.