In 50 years, no one will care about the fiscal cliff or the Euro crisis. They'll just ask, "So the Arctic melted, and then what did you do?"

Fossil fuel is very seductive stuff. [John Maynard] Keynes once said that, as far as he could tell, the average standard of living from the beginning of human history to the middle of the eighteenth century had perhaps doubled. Not much had changed, and then we found coal and gas and oil and everything changed. We're reaping the result of that, both ecologically and socially.

There are many places where we need to fight important battles to make sure that customers have access to solar.

There's a part of all of us whose impulse is to say, "Let's keep everything the same until I die and then you can do whatever you want afterward." And that's a difficult part.

TV is sometimes accused of encouraging fantasies. Its real problem, though, is that it encourages-enforces, almost-a brute realism. It is anti-Utopian in the extreme. We're discouraged from thinking that, except for a few new products, there might be a better way of doing things.

In the last two years 24 countries have set new all-time temperature records. We've seen flooding on an epic scale in every continent .

The laws of Congress and the laws of physics have grown increasingly divergent, and the laws of physics are not likely to yield.