Ethics is a branch of philosophy that deals with morals and values. Environmental ethics refers to the moral relationships between humans and the natural world. It addresses such questions as, do humans have obligations or responsibilities toward the natural world, and if so, how are those responsibilities balanced against human needs and interests? Are some interests more important than others?

Efforts to answer such ethical questions have led to the development of a number of schools of ethical thought. One of these is utilitarianism, a philosophy associated with the English eccentric Jeremy Bentham and later modified by his godson John Stuart Mill. In its most basic terms, utilitarianism holds that an action is morally right if it produces the greatest good for the greatest number of people. The early environmentalist Gifford Pinchot was inspired by utilitarian principles and applied them to conservation. Pinchot proposed that the...