Obviously China is clearly taking the lead in some areas, but when it comes to the most advanced innovation, it's still America.

Everything I’ve ever gotten in life is largely due to the fact that I was born in this country, America, at this time with these opportunities for its citizens. It is the primary obligation of our generation to turn over a similar America to our kids.

The historical debate is over. The answer is free-market capitalism.

I don't think a monarchy led by 75- and 80-year-old men [Saudi Arabia] in today's modern world is really sustainable.

I am always a little skeptical on the water thing because I have been hearing that for 30 years, but one year it's going to be true. With the rising populations, Yemen could be the first country in the world, or Sana'a the first major city in the world, to run out of water, that's from Yemeni hydrological engineers and the United Nations. Sooner or later, all of these people, from 7 to 9 billion, all of them want to live like America, will be consuming so much more water that some of the societies will hit a wall without more sustainable environmental practices.

Communism was a great system for making people equally poor - in fact, there was no better system in the world for that than communism. Capitalism made people unequally rich.

C'mon kids! Wake up and smell the CO2! Take over your administration building, occupy your university president's office, or storm in on the next meeting of your college's board of trustees until they agree to make your school carbon neutral.