Image from Dr. Jeff Masters’ WunderBlog.
“The Biggest Control Knob: Carbon Dioxide in Earth’s Climate History” (57:06)
Bjerknes Lecture at AGU2009. Presented by Richard B. Alley Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania, USA
Great lecture by the master science communicator Prof. Alley. The talk covers the very basics of paleoclimate: how do we know that CO2 is the main driver of climate.
The lecture is available for download at the AGU website, but unfortunately it is only available in flash format. http://www.agu.org/meetings/fm09/lectures/videos.php
For your convenience I have made a vimeo-version available:
There are a number of good posts written about the lecture, if you want to read more about it before you watch it:
Ben Santer’s talk “A Tribute to Stephen Schneider and an Example of ‘Setting the Scientific Record Straight'” at American Geophysical Union Fall meeting 2011 (The Stephen Schneider Global Environmental Change Lecture).
The 30 minute talk starts with a tribute to Stephen Schneider, and is followed by a debunking of Prof. Will Happer’s claim in a testimony to the US House of Representatives (see image above). The Q&A that follows includes a discussion of potential factors that might have caused the slowing down of global warming since 1998 (aerosols from Chinese coal plants, the solar cycle, natural variability etc.) and two personal anecdotes about Stephen Schneider.