Argues forcefully for greater unity and common theoretical principles as steps toward greater cohesion in environmental activity. Contents: The environmentalist's 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 growth; Pollution control; Biological diversity; Land use policy; Diverging worldviews, converging policies; Intertemporal ethics; Interspecific ethics; Epilogue: Differing senses of place.