Remember, the difference between the world frozen over, in an ice ball, and the warming period we're in now is just 6 degrees centigrade. A change of just 1 degree can have a huge effect.

I said that more people in more places can now compete, connect and collaborate with equal power and equal tools than ever before.

I think the Arab awakening has changed everything and I think a lot will depend on what people there ask of us, may be nothing, it may be a lot. I think that really depends how they find their voice and what they see as their real interest, and hopefully that would be for more schools and not more tanks.

Capitalism makes people unequally rich. Communism makes people equally poor.

You'll know the green revolution has been won when the word 'green' disappears.

When I was growing up, my parents told me, 'Finish your dinner. People in China and India are starving.' I tell my daughters, 'Finish your homework. People in India and China are starving for your job.'

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