This Environmental Education Teacher's Guide, developed for use in the junior high school, is designed to familiarize teachers with how an environmental education program can help in their teaching and in achieving the goals of the school. The suggested core activities in this guide are designed to be a motivating way of introducting junior high school students to a practical understanding of the natural environment. The activities focus on those factors important in evaluating the stability of natural ecosystems and thereby identify areas sensitive to human development. The practicality of the unit is enhanced by the application of stability concepts in the content of a watershed. The activities have been devised to develop specific understandings, feelings and skills. Basic concepts, attitudes, objectives and skills are identified and a pre-post test is included to help the teacher assess educational outcomes. (BT)