Environmental Ethics tells us not how, but why we must change our "earthkeeping" habits. Current crises of pollution and resource depletion reflect profound difficulties with some fo the most basic priniciples in our accepted systems of values. They challenge us to assess the adequacy of these principles and to discover a new framework for describing what it means to behave ethically. This valuable textbook organizes, philosophically develops, rationally analyzes, and criticizes the body of ideas known as "