The world is on fire, and I'm doing my best to help steer the firetruck.

[Kids] will grow up into a world that's difficult and wonderful, and they'll make the best of it they can, and hopefully help turn it in the best possible direction.

The world hasn't ended, but the world as we know it has-even if we don't quite know it yet.

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

If there's horrible flooding in Pakistan or a horrible heat wave in Texas, we're no longer able to call it an act of God, or a natural disaster, or something like that, the way we could have through all of human history until 35 or 40 years ago.

Katrina opened a good door and Al Gore went through it with his movie.

Where people aren't as deeply reliant on fossil fuel as in the United States, it's far easier for them to imagine change on this scale. When you go to Europe, they're much more ready. They use half the amount of energy per capita that we use. They can imagine using less than that. They see the benefits. They're ready to go.