Introduction to Ethics - An argument against objective morality that defeats itself

This is a lecture about chapter 14 of Russ Shafer-Landau's book 'Whatever Happened to Good and Evil?' This chapter is about the popular argument that starts from the claim that there is persistent disagreement about moral matters to the conclusion that there are no objective moral facts or laws. Shafer-Landau is able to turn this argument against moral skepticism itself. This is a pretty long video lecture, but I spend a lot of time modifying the argument, which should be helpful in learning how to deal with arguments themselves. This is part of an introductory level philosophy course, Introduction to Ethics.