“South Park” just ran a couple episodes about climate change. The show gets a lot right about the history of the problem, but it screws up a key factor of human nature in the process, one that could completely flip the future. …”South Park” sees the world as zero-sum: my win is your loss. In a zero-sum world, no one would ever sacrifice soy sauce to save the planet, or money to build roads. But climate change isn’t a zero-sum problem. Instead, it might be what economists call a “collaboration problem.” …This isn’t to say that government, or other groups, actually will take the steps necessary to end climate change. Just that we could.