The morality of an act is a function of the state of the system at the time it is performed.

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

What features of your daily life do you expect to be improved by a further increase in population?

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

Incommensurables cannot be compared.

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

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.