It's good for young people to be angry about something.

A significant number of petroleum geologists believe that we will reach the global maximum of petroleum extraction within this decade or that we have already reached it. Peak Oil happened in 1970 in America, when over half of our oil that we gained from the soil was exhausted ... This is very disturbing, regardless of global warming.

The most profound security threat we face today is global warming....climate change has the capacity to change the way all of us live.

I want to talk about one barrier that has not been broken. I want you to support Hillary [Clinton] for me, too, because I want to break a ceiling. I am tired of the stranglehold that women have had on the job of presidential spouse.

By lifting the weakest, poorest among us, we lift the rest of us as well.

I believe that a worthwhile life is defined by a kind of spiritual journey and a sense of obligation.

I want to say to you is that James Madison and Thomas Jefferson did not intend to drive a stake in the heart of religion and to drive it out of our public life. What they intended to do was to set up a system so that we could bring religion into our public life and into our private life without any of us telling the other what to do.