The intent of this module is to engage students (grades 9-11) in an examination of issues that arise as a result of human activities in the physical environment. Activities are organized into two sections: the first focusing on weather modification and construction of dams as examples of planned environmental change and the second focusing on unplanned environmental changes (desertification, unintended weather modification, increases in atmospheric carbon dioxide, and erosion). To demonstrate socio-scientific conflicts, a simulation game, role-playing simulations, and dilemma/discussion formats are utilized to highlight and heighten the underlying issues. Dilemmas are brief stories posing a critical decision to be made by a main character. This decision revolves around conflicts between two or more moral/ethical issues (as identified by Kohlberg) presented in the situation, and it is the moral/ethical implication that provides the thrust for later student discussions. Preceding each dilemma are readings/case studies providing background information regarding issues in the dilemma. Questions and sample student responses (representing positions taken by typical students) are provided to stimulate thinking about the issues and generate discussions. The module may be used as a separate unit of study, mini-course, or incorporated in such subject areas as social studies, language arts, or science. (JN)