The seminar begins with an examination of how moral philosophers have considered the problem of the ethics of policy choice. In the next part of the seminar we explore human rights and the role of ethics in international politics. We then focus on problems in contemporary international ethics, wars, massacres and terrorism; international intervention; and global economic justice. We conclude with a discussion of the debate between the proponents of cosmopolitan justice, on the one hand, and the defenders of national self-determination, on the other, over the conditions of world order. This course is open to students across all Columbia University schools and affiliate institutions.