People who study climate change talk about “the tragedy of the horizon.” The tragedy is that we don’t care enough about those future people, our descendants, who will have to fix, or just survive on, the planet we’re now wrecking. We like to think that they’ll be richer and smarter than we are and so able to handle their own problems in their own time. But we’re creating problems that they’ll be unable to solve. You can’t fix extinctions, or ocean acidification, or melted permafrost, no matter how rich or smart you are. The fact that these problems will occur in the future lets us take a magical view of them. We go on exacerbating them, thinking—not that we think this, but the notion seems to underlie our thinking—that we will be dead before it gets too serious. The tragedy of the horizon is often something we encounter, without knowing it, when we buy and sell. The market is wrong; the prices are too low. Our way of life has environmental costs that aren’t included in what we pay, and those costs will be borne by our descendents. We are operating a multigenerational Ponzi scheme.