Presented is the learner's guide for a high school level independent study course in environmental studies. The manual is divided into two sections: (1) The Nature of the Environment, with lessons on ecosystems, limiting factors, interdependence and adaptation; and (2) Economic, Political, Behavioral, and Ethical Aspects of Environmental Studies, which covers population, energy, the urban environment and ethics. Each of the nine lessons lists objectives, presents a reading assignment, discusses the readings, offers a self test, and provides a written assignment. This correspondence course is offered by Indiana University's Independent Study Division. (WB)