(On being the world's richest man) I wish I wasn't ... There's nothing good that comes out of that. You get more visibility as a result of it.

The world won't care about your self-esteem. The world will expect you to accomplish something BEFORE you feel good about yourself.

Should surveillance be usable for petty crimes like jaywalking or minor drug possession? Or is there a higher threshold for certain information? Those aren't easy questions.

One thing people underestimate is how markets don't allow anyone to do anything except make better and better products. There's not much leeway. The world is a lot more competitive than most people think, particularly in a high-technology area. If a company takes its eye off improving its products, if it tries to do anything that would be viewed as an exercise of power, it'll be displaced very rapidly.

Now, we put out a lot of carbon dioxide every year, over 26 billion tons. For each American, it's about 20 tons. For people in poor countries, it's less than one ton. It's an average of about five tons for everyone on the planet. And, somehow, we have to make changes that will bring that down to zero.

Change the boundaries of business.

Certainly there's a phenomenon around open source. You know free software will be a vibrant area. There will be a lot of neat things that get done there.