Climate change is real, caused by human activity and already devastating our nation and planet. The United States must lead the world in combating climate change and transforming our energy system away from fossil fuels and toward energy efficiency and sustainability.

The basic issue of an American society which is fair, which is providing opportunity for all, is nowadays being replaced by the correct perception that we're living in a rigged economy - where it doesn't matter how hard you worked, the result will be all the income goes to the people at the very top. It's leading to a lot of frustration and anger, and people want some fundamental changes to the way we do economics and growth.

There are a lot of smart honest, progressive people who I think can be good presidents.

Fifty years ago, great schools like the University of California and the City University of New York - as well as many state colleges - were tuition free. Today college is unaffordable for many working class families. For the sake of our economy and millions of Americans, we must make higher education more affordable.

If the environment were a bank, it would have been saved by now

If you looked at Jeb Bush's campaign, it's more than just money. It's the nature of the candidate and the message and all that stuff.

I prefer to stay on the important issues facing the American people.