A Land Ethic

Over fifty years ago, the prophetic Aldo Leopold argued for a "land ethic," asserting that "a thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community. It is wrong when it tends otherwise." My question (up for philosphical debate) is this: is a land ethic our moral responsibility because there is something intrinsically valuable about the nature environment and all of its components (an ecocentric position)? Or, is a land ethic our moral responsibility because of what the natural environment provides for the human race, ie. a means of survival (more of a utilitarian argument)? Before you jump to the "both" conclusion, think about the different policy and management implications of each.