Dr. Michael Mann, climate change export and author of The Madhouse Effect: How Climate Change Denial Is Threatening The Planet, joins the Thom Hartmann Program to discuss the climate change tipping point and the domino extinctions that may have already started.

Thom is a four-time Project Censored-award-winning, New York Times best-selling author. His national daily progressive radio talk show is distributed to radio stations nationwide by Westwood One, Pacifica, and Free Speech TV. More people listen daily to the Thom Hartmann Program than any other progressive talk show in the nation.