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If carbon came out of the ground, it has to go back into the ground.

Carbon is the stuff of life, and it's the stuff of everything used by human society. All of our materials are made of carbon or of substances, such as steel or glass, which are produced through the utilization of carbon.

Either you abandon fossil fuels, or you find a way to get that carbon back.

Carbon is probably a bit harder to wrap since it's procedural.

Persistence is to the character of man as carbon is to steel.

People have got to get used to making low carbon choices. If they have a direct incentive to do so they will think about it. Many times a day you have a choice between a low carbon option and a high carbon option, whether it is at home or at work.

When you boil down the real facts and statistics of what carbon dioxide is doing to this planet... to not feel like you have to do something... I don't think you're human.

We hear people talk about putting a price on carbon, but they won't talk about how much that price of carbon is.

In corn, I think I've found the key to the American food chain. If you look at a fast-food meal, a McDonald's meal, virtually all the carbon in it - and what we eat is mostly carbon - comes from corn.