Barron’s: You’ve written about the oil age, which has lasted for over 150 years. Is it over now?
Daniel Yergin: I’ve been thinking about it going back to my fourth book, The Prize. The assumption was that demand would always just grow, or when it peaked, it would be so far into the future it wasn’t worth thinking about. And that oil had a permanent monopoly on transportation. None of that is true anymore. I think oil and natural gas will continue to be important parts of the energy mix for quite a long time. But it’s going to be a very different mix. Renewables will be a much bigger part of it. Maybe it will be hydrogen or another thing. So it won’t be an oil age—it will be an energy mix age.