I think it's crazy for us to play games with our children's future. We know what's happening to the climate, we have a highly predictable set of consequences if we continue to pour greenhouse gases into the atmosphere.

One of the main reasons we ought to re-elect President Obama is that he is still committed to constructive cooperation... He appointed Republican secretaries of defense, the Army and transportation. He appointed a vice president who ran against him in 2008.

Posterity is the world to come; the world for whom we hold our ideals, from whom we have borrowed our planet, and to whom we bear sacred responsibility. We must do what America does best: offer more opportunity to all and demand responsibility from all.

I think the idea of moving to a cleaner energy future and doing more energy efficiency makes smart sense.

We know there are billions of stars and planets literally out there, and the universe is getting bigger. We know from our fancy telescopes that just in the last two years more than 20 planets have been identified outside our solar system that seem to be far enough away from their suns - - and dense enough - - that they might be able to support some form of life. So it makes it increasing less likely that we're alone. But if we were visited someday, I wouldn't be surprised.

When people think, Democrats win.

First, I worry about climate change. It's the only thing that I believe has the power to fundamentally end the march of civilization as we know it, and make a lot of the other efforts that we're making irrelevant and impossible.