The environmentalists' dilemma -- Moralists and aggregators: the case of Muir and Pinchot -- Aldo Leopold and the search for an integrated theory of environmental management -- Conservationists and preservationists today -- Worldviews: a whirlwind tour -- The pressures of grwoth -- Pollution control -- Biological diversity -- Land use policy -- Diverging worldviews, converging policies -- Intertemporal ethics -- Interspecific ethics.