The aquifer [is] the water table people need to keep secure. Nature has this incredible system of water purification under the ground. Ground water is much better to drink than surface water because it filters out the bacteria that can cause all sorts of problems.

It is an incredibly hopeful experience watching communities come together and actually reassemble democracy. The democracy's been taken away from us. But they're reinventing democracy out there in rural Pennsylvania, in Philadelphia, in Pittsburgh.

It's the next phase of authorship of this country's energy future. It's gonna come from the people. It's not gonna be deus ex machina or Obama ex machina, or science ex machina. It's gonna be the people. It's not going to be a wind energy company that comes in and saves the day. It's going to be the people who figure this out.

There's something really happening and really moving, and it's exciting and it makes me very optimistic because it is going to be the engine for how we really combat climate change. Which is strong communities.

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.

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.

It's remarkable to watch the president, with all the weight of his ability to command rhetoric with the bully pulpit behind him, make a clear speech about climate change and why that's so important for us all to focus on. And that is a rather remarkable thing to see. It's enormously powerful.