When I was in my 40s, Microsoft was my primary activity.

WWW? Nice toy, but what a waste of time.

When I say "an energy miracle," I mean that there will be some form of energy whose 24 hour cost really is competitive with hydrocarbons given, say, 20 years of learning curve. You invent it, then you look at how much its costs go down over the next 20 years, that it really beats hydrocarbons.

Success today requires the agility and drive to constantly rethink, reinvigorate, react, and reinvent.

The huge turnout for Live 8 here and around the world proves that thanks to the leadership from people like Tony Blair and Gordon Brown the world is beginning to demand more action on global health and poverty.

Most people overestimate what they can do in one year and underestimate what they can do in ten years.

I choose a lazy person to do a hard job. Because a lazy person will find an easy way to do it.