[On making progress on climate change] We’re in a stage where no one really knows what to do. And it’s easier to try out things in small groups and figure out what works. The problem is that the climate scientists say we don’t have time for all this slow, cautious experimentation anymore, because the train is speeding. That’s the nature of the problem. It’s the result of having spent a long time talking about the climate problem in formats that really didn’t make progress.