Lecture, three hours. Requisite: one course from Economics 41, Life Sciences 40, Political Science 6, Statistics 10, 12, 13, or other statistical analysis course approved by instructor. Examination of challenges of balancing environmental protection with wants and needs of people in economy. Focus on how to design efficient public policies that meet environmental goals. How to quantify cause-and-effect relationships, for example, between pollution and infant mortality, using non-experimental data. P/NP or letter grading.