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

Unfortunately, there's a lot of people in high places who understand the science but don't like where the policy leads them: too much government control.

Most people out there are just trying to keep their job and provide for their family. If climate change is now a once-in-a-mortgage problem, and if food prices start to spike, people will pay attention.

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.

When we talk about climate, we need to do everything we can to set the stage before the actors come on. And they may only have one chance at success. We should keep thinking: How do we maximize that chance of success?

We need to start prioritizing people, not polar bears.

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