In the end, climate change is a math problem.

All the science in the last few years, or almost all of it, really serves to show that the [climate] effects are larger and more rapid than we had thought even a decade ago.

The earth is a museum of divine intent.

I think that it is impossible to think of a threat to social justice greater than what we are doing to the earth's atmosphere at the moment.

When you have solar panels, your electricity gets there for free, no one's figured out how to meter the sun yet. And that's good.

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

If you consider that there are a million people forced out of their homes by Katrina, multiply that by 150, and then stick those people in countries who, as inconceivable as it seems, are less prepared than we were to deal with the whole thing.