Hank welcomes David Keith (Gordon McKay Professor of Applied Physics, Harvard John A. Paulson School of Engineering and Applied Sciences and Professor of Public Policy, Harvard Kennedy School) to Straight Talk to discuss his physics background, how he would define the climate challenge, climate diplomacy and addressing the global governance problem, what is needed to truly achieve carbon neutrality, solar geoengineering, and the next technologies in the energy industry. David Keith: https://keith.seas.harvard.edu/people/david-keith