A multi-disciplinary approach to environmental studies for high school students, combining the areas of earth science, social science, and health education, is developed in this guide. Student Action for the Valley Environment (SAVE) is primarily a simulation program concerned with a serious problem of today--the survival of life in the cities. It encourages student awareness, role playing, and problem-solving by having students propose and decide on alternate ways of structuring a new city, with their final plan compared to that of the actual city of Phoenix, Arizona. The nine-lesson approach outlines for each lesson its aim, procedure, materials needed, time allotment, supplementary materials, and future assignments. Lessons concentrate on a study of the urban environment through "Conflict," a simulation game, site features, city design, the concept of change, population, land use, and the development of a model city. Numerous enrichment activities are suggested and elaborated upon, greatly enhancing the unit and promoting its usefulness in an interdisciplinary instructional program. These cover a wide variety of environmental factors and considerations. A data bank or background information about Phoenix is also included. This work was prepared under an ESEA Title III contract for Project Outreach. (BL)