The 2012 Holiday Lecture, free to watch or download
Lecture 1: The Deep History of a Living Planet, by Andrew Knoll, Ph.D.
Lecture 2: Building Scientific Knowledge: The Story of Plate Tectonics, by Naomi Oreskes, Ph.D.
Lecture 3: Earth's Climate: Back to the Future, by Daniel Schrag, Ph.D.
Lecture 4: Climate Change: How Do We Know We're Not Wrong?, by Naomi Oreskes, Ph.D.