Dr. MICHAEL E. MANN is the Presidential Distinguished Professor in the Department of Earth and Environmental Science at the University of Pennsylvania, with a secondary appointment in the Annenberg School for Communication. He is also the director of the Penn Center for Science, Sustainability, and the Media (PCSSM). Mann is the author of six books, including Dire Predictions: Understanding Climate Change and The Madhouse Effect: How Climate Change Denial is Threatening Our Planet, Destroying Our Politics, and Driving Us Crazy. Our Fragile Moment: How Lessons from Earth’s Past Can Help Us Survive the Climate Crisis (PublicAffairs) is his latest work.