GORMLEY - STEVEN E. KOONIN - MAY 5

When it comes to climate change, many have declared that "the science is settled," but according to author Steven Koonin, who served as a science advisor to the Obama administration, the core questions about how the climate responds to human influence remain largely unanswered. Koonin joins Gormley to tell us about the questions he explores in his new book "Unsettled: What Climate Science Tells Us, What It Doesn’t, and Why It Matters."