This is a podcast from a talk of David Friedman on “Global Warming, Population, and the Problem with Externality Arguments”. The talk was part of the monthly meetings of the Libertarian Alliance. It was given on Monday 14th January 2013. The Libertarian Alliance organises a meeting on every second Monday of the Month at The Institute of Education, off Russell Square – student bar, Room S13, Thornhaugh Street , London , WC1B 5EA. The meetings are free of charge and everyone is welcome. Coming along is highly recommended. More information can be found here. And here is the talk.