Natural gas is a bridge fuel. But it's not a bridge - it's a gangplank. It's either a bridge in space or a bridge in time. The bridge in time we don't need. We have renewable technology right now.

There are regulations all over the spectrum that have to be done to the existing situation right now. But the only policy that makes sense is a nationwide moratorium: no new fracking, no new fracked wells.

We should be moving vigorously towards renewable energy. The technology of which is right here right now.

In a couple of decades you have half of the wells that are drilled right now, and you're talking about numbers in the millions of wells drilled, leaking. That's a huge crisis in terms of water contamination. There's no way to fix that problem.

We're not living in a society that science actually dominates the conversation. We're living in a situation where some science is allowed and a lot of it's about policy.

I have to have faith that we're going to succeed in transforming where we get our energy from. The big worry is whether or not we're going to do it before it's too late. And I think nobody knows the answer to that.

I don't believe we're only motivated by our own self-interests. Often out of crisis comes this enormous wellspring of generosity and motivation.