Can law change human behavior to be less environmentally damaging? Law will be examined through case histories including: environmental effects of national security, pesticides, air pollution, consumer products, plastics, parks and protected area management, land use, urban growth and sprawl, public/private transit, drinking water standards, food safety, and hazardous site restoration. In each case we will review the structure of law and evaluate its strengths and weaknesses. This Yale College course, taught on campus twice per week for 50 minutes, was recorded for Open Yale Courses in Spring 2010.