On how he would tackle the issue of climate change and criticism of his support for fracking

“At some point, we want to get to as clean an energy system as possible. And that’s going to require all kinds of innovations, some of which we’ve never even seen to this day. It’ll take a while before we are completely free of all hydrocarbons. Let’s be brutally honest. I don’t see any way that that could possibly ever happen by 2030. But I do share the urgency that we’ve got to make that transition much more rapidly than what we’re seeing take place today.”