The idea that global warming is the most important problem facing the world is total nonsense and is doing a lot of harm.

The fundamental reason why carbon dioxide in the atmosphere is critically important to biology is that there is so little of it. A field of corn growing in full sunlight in the middle of the day uses up all the carbon dioxide within a meter of the ground in about five minutes. If the air were not constantly stirred by convection currents and winds, the corn would stop growing.

All the time worrying about pushing the children and getting them to be mathematically literate and all that stuff. It's terribly hard on the kids. It's also hard on the teachers. And I think it's totally useless.

As we look out into the Universe and identify the many accidents of physics and astronomy that have worked together to our benefit, it almost seems as if the Universe must in some sense have known that we were coming.

That's what I learned from World War II. Things are always more complicated than most people believe.

Technology must be guided and driven by ethics if it is to do more than provide new toys for the rich.

The technologies that raise the fewest ethical problems are those that work on a human scale, brightening the lives of individual people.