"I think the environment is such a challenging problem. Two of the major reasons for that are that it's a commons problem. Basically, there's a greater good, and we all have to sacrifice a little bit individually to achieve that greater good. People tend to be self interested, so those kinds of problems are really challenging because, I'm sitting here going, 'Should I cut back on my consumption? Or should I stop flying?'

That's a cost to me in order to accrue a benefit to the group. And some people are willing to do that, but a lot of people aren't. The other real challenge with climate is that the effects of climate are diffuse. They occur slowly and over time. They're becoming more observable now, but they haven't been particularly observable to people. It's like, 'Oh, the world temperature's gonna go up by a certain number of degrees ove ...