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

The rational man finds that his share of the cost of the wastes he discharges into the commons is less than the cost of purifying his wastes before releasing them.

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.

Moreover, the practical recommendations deduced from ecological principles threaten the vested interests of commerce; it is hardly surprising that the financial and political power created by these investments should be used sometimes to suppress environmental impact studies.

The optimum population is, then, less than the maximum.

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