If we want to make real progress on climate action, we have to be honest with ourselves: asking people to sacrifice in the name of a better future only gets us so far. Sure, there are moments of altruistic inspiration. But enduring systems change? That happens when we make the sustainable path the easy, obvious, and self-interested one—when it works better, faster, cheaper. In other words, we need to design climate action that doesn’t just appeal to our better angels, but to our everyday ince...