"Environmental Dilemmas" is one of the "Preparing for Tomorrow's World" (PTW) program modules. PTW is an interdisciplinary, future-oriented program which incorporates information from the sciences and social sciences and addresses societal concerns which interface science/technology/society. The program promotes responsible citizenry with increased abilities in critical thinking, problem-solving, social/ethical reasoning, and decision-making. The dual purpose of the module is to introduce students (grades 10-11) to current/emerging environmental issues and to emphasize the moral/ethical decision-making related to the issues. This teaching guide discusses the purposes of the student module, strategies employed (focusing on the dilemma debate/discussion technique), module structure and objectives, and use of dilemmas in bioethics in the school curriculum. The module may be used as a separate unit of study, as a mini-course, or incorporated into existing subject areas, including civics, history, biology, chemistry, environmental science, and earth science. Theoretical basis for the PTW program (considering the social-scientific reasoning model used), and final student activity (developing guidelines for environmental policy) are discussed. A chart indicating moral issues (as defined by Kohlberg) contained in the 12 dilemmas presented in the student material, and selected bibliographies on moral/social/ethical development and the environment are included. (JN)