I realized about 10 years ago that my wealth has to go back to society. A fortune, the size of which is hard to imagine, is best not passed on to one's children. It's not constructive for them.

Today, we take the risk of nuclear war quite seriously, climate change not so much and epidemics least of all. But no single country, not even the United States, is well prepared. And even if one country is doing the right things to protect itself, it has to be a global thing.

If I was down to the last dollar of my marketing budget I'd spend it on PR!

...one of the most inventive forms of creative capitalism involves someone we all know very well. A few years ago, I was sitting in a bar here in Davos with Bono. Late at night, after a few drinks, he was on fire, talking about how we could get a percentage of each purchase from civic-minded companies to help change the world. He kept calling people, waking them up, and handing me the phone to show me the interest.

Scientists and companies weren't creating things like new vaccines. Now that we have this fund that's there to buy at the lowest price, but buy for those people these medicines, we see scientists everywhere coming up with those new tools.

Sorghum is kind of unusual. It can go to very high heats, but it's not as productive in most environments as maize is.

In the U.S., we believe the best way to improve lives is to improve public education.