The philosopher Ludwig Wittgenstein once remarked that if you ask a man how much is two plus two and he tells you five, that is a mistake. But if you ask a man how much is two plus two and he tells you ninety-seven, that is no longer a mistake. The man you are talking to is operating with a wholly different logic from your own.

There is definitely global warming, and man is definitely contributing to it. Go out to, say, Montana and talk to some pretty conservative people, hunters and fishermen. They know that in the trout stream they fished when they were growing up, the trout are stressed because the water temperature is going up. They know the hunting season has been delayed because the snows are coming later, and therefore the elk aren't coming down from the mountains.

Rock stars get room keys, I get business cards. Wherever I go I meet innovators of wind power equipment, solar energy operators.

I don't think a monarchy led by 75- and 80-year-old men [Saudi Arabia] in today's modern world is really sustainable.

I'm from Minnesota. I'm optimistic. I mean, that's just who I am.

Combating climate change requires government policy, and most conservatives hate the idea of more government regulation. Because they hate the prescription, they deny the diagnosis.

Iraq may still have a decent outcome...but even if it becomes Switzerland, we overpaid for it.