One of the chief problems of the American environmental movement is the definition of philosophy--the exploration, examination, and elucidation of ideas--of the many different causes that have been combined in it. In this book Joseph Petulla sorts out the various issues and concepts of environmentalism by tracing their inspiration and values from the three traditions of environmental thought--the biocentric, the ecologic, and the economic. He examines the movement's historical roots, assumptions, goals, values, politics, struggles, successes, limitations, trends, and, finally, the priorities it has brought to the national consciousness. This disentangling, clarifying process involves political implications and judgments about the recent directions of the environmental movement. Absolutist assumptions and methodologies often lead environmentalists and their opponents into conflict, yet even conflict groups must live with each other in the natural world, and that natural world must be understood by reason. This book attempts to establish wider ethical understanding and a political basis for support of environmentalism by promoting rational discussion about increasingly important subjects.