This summer's fires, droughts, and record-high temperatures should serve as a wake-up call. The longer a narrow and ignorant elite condemns Americans and the rest of humanity to wander aimlessly in the political desert, the more likely it is that we will all end up in a wasteland. But instead of a Moses guiding humanity in this new and dangerous wilderness, a gang of science deniers and polluters currently misguides humanity to ever-greater danger. We are all climate refugees now and must chart a path to safety. By Jeffrey D. Sachs.