Climate change is part of the normal order of things, and we know it was happening before humans came.

The reason why new concepts in any branch of science are hard to grasp is always the same; contemporary scientists try to picture the new concept in terms of ideas which existed before.

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.

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

There is a great satisfaction in building good tools for other people to use.

I have the freedom to do what I want... bright people to talk to every day.

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