How can we resolve environmental disagreements without picking winners and losers or merely agreeing to disagree? This interdisciplinary course explores the most effective strategy for doing so in negotiating agreements of all kinds, using the multilateral agreements that are at the center of international environmental law as illustrative examples. Students spend about half of the course exploring the nature of international law, salient features of the international system, and the content of multilateral environmental agreements of interest to them. In the other half, students first learn the art of win-win negotiation, and then put their skills to work as they assume the roles of member-states of the International Whaling Commission to negotiate the fate of a controversial proposal to end the international ban on commercial whaling.