Sometimes I feel like there isn't enough Prozac in the world to make Environmental Protection Agency people feel better about their jobs. They're going out there, they're trying to protect Americans and then time and time and time again they get their knees cut off at the policy level.

I'm a night owl, and luckily my profession supports that. The best ideas come to me in the dead of night.

They're a lot of great scientists and their mission is to protect people. It's the Environmental Protection Agency, but it's really a people protection agency. And they're out there trying to do their job and do the science.

We are letting the extractive energy industries turn the world inside out.

When the natural gas industry was knocking on my door, they were knocking on the door of millions of people. And that became something that Americans really needed to focus on.

What we've got is the wholesale embrace of fracking domestically, internationally and for export. And this couldn't be further from what we really need to do to address climate change.

I think that the world is in the middle of a huge transition that we have to make to renewable energy. We have to transition away from fossil fuels very, very quickly.