Politicians have responsibility to act if the public opinion changes. Flooding, storms, droughts are all getting people talking about climate change. I wonder if someday Atlanta will run out of water?

If you start getting instability in large powers with nuclear weapons, that's not a good day.

You get a series of super-typhoons into Shanghai and millions of people die. Does the population there lose faith in Chinese government? Does China start to fissure? I'd prefer to deal with a rising, dominant China any day.

We need to start prioritizing people, not polar bears. We're probably less adaptable than them, anyway. The farther you are from the Beltway, the more you can have a conversation about climate no matter how people vote. I never try to politicize the issue.

I see climate change as one of the driving forces in the 21st century. With modern technology and globalization, we are much more connected than ever before. The world's warehouses are now container ships.

People working on climate change should prepare for catastrophic success.

I like to think of climate action as a three-legged stool.