Theoretical physicist Steven Koonin covers what the latest climate science actually tells us versus what alarmists want us to believe about everything from melting ice caps to extreme weather events. We end the conversation with an overview of Steven's other domain of expertise: multiverses!

Steven Koonin is the author of Unsettled: What Climate Science Tells Us, What it Doesn't, and Why it Matters. From 2009 to 2011, he was Under Secretary for Science at the Department of Energy in the Obama administration.