The question is: do we pay a little bit more now? Or do we pay a whole lot later? For the equivalent of a postage stamp a day for each American, we can put a price on carbon today that will send a signal to private capital to invest in the clean technologies of tomorrow. Taking a vast portfolio of new energy solutions to scale will ultimately drive down costs through competition.

Each and every one of us should stop playing small and license ourselves to become one of the giants of the new century. We will need champions by the truckload.

I think that America could not become America until it dealt with the disenfranchisement of women and African Americans in the last century. It had to. America could not become America until it dealt with that. And did it deal with it perfectly? No. But it had to confront it.

Now, here's a good question: should serious people focus on global political instability - terrorism, failing states, nuclear weapons - or should we focus on global climate instability - droughts, floods, extreme weather? Here's the correct answer: yes, both, because climate disruption will make every other national security problem worse.

We've have to heed our Biblical obligation to be good stewards of the Earth after leaving the Garden of Eden.

Keith Ellison is an organizer's organizer.He's one of the only Muslims in Congress, so you have a big statement there.

We're just trying to end illegitimate government support for a single technology, which is un-American. We should be leading the world in the next generation of technological innovation. But we can't unleash private capital because of what the government is doing to stifle innovation and to choke competition.