AS THE AMERICAN PUBLIC CONTINUES sleepwalking into a future of energy scarcity, climate change, and geopolitical turmoil, we have also continued dreaming. Our collective dream is one of those super-vivid ones people have just before awakening. It is a particularly American dream on a particularly American theme: how to keep all the cars running by some other means than gasoline. We'll run them on ethanol! We'll run them on biodiesel, on synthesized coal liquids, on hydrogen, on methane gas, on electricity, on used French-fry oil . . . !