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

Ecology is the overall science of which economics is a minor speciality.

A finite world can support only a finite population; therefore, population growth must eventually equal zero.

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

Value is a relative concept: the value of each action is determined by comparing it with other possible actions.

The god who is reputed to have created fleas to keep dogs from moping over their situation must also have created fundamentalists to keep rationalists from getting flabby. Let us be duly thankful for out blessings.

No one should be able to enter a wilderness by mechanical means.