In an interdisciplinary team-taught course, students completed several short writing assignments and a term paper that integrated psychological and environmental issues. The writing assignments asked students to respond to readings and apply knowledge to their own lives or to new situations. In this paper, we discuss three short writing assignments, which dealt with (a) bottled water and social norms, (b) climate change and persuasion techniques, and (c) the commons dilemma, operant conditioning, and overfishing. We also describe a term paper assignment in which students selected an environmental issue, researched the ecological and psychological causes and solutions, and wrote a scientific paper discussing and integrating these ideas. These assignments provide examples for instructors about how psychological and environmental studies can be integrated within one class or one assignment.