The environmental studies program consists of four components: a one-semester introductory course, ENVS 112 (1/2 unit); three semester courses in "core" subjects (biology, chemistry, and economics, for 1 1/2 units); a selection of 1 1/2 units (three courses) from affiliated courses in at least two departments; and a one-semester capstone seminar, ENVS 461 (1/2 unit). The concentration requires a total of 4 units. Affiliated courses are offered in anthropology, biology, chemistry, economics, philosophy, physics, political science, religious studies, and sociology.