We will have to return to traditional modes of inhabiting the landscape — villages, towns, and cities, composed of walkable neighborhoods and business districts — and the successful ones will have to exist in relation to a productive agricultural hinterland, because petro-agriculture (as represented by the infamous 3000-mile Caesar salad) is also now coming to an end. Fortunately, we have many under-activated small towns and small cities in favorable locations near waterways. This will be increasingly important as transport of goods by water regains importance.We face an epochal demographic shift, but not the one that is commonly expected: from suburbs to big cities. Rather, we are in for a reversal of the 200-year-long trend of people moving from the farms and small towns to the big cities. People will be moving to the smaller towns and smaller cities because they are more appropriately scaled to the limited energy diet of the future. I believe our big cities will contract substantially — even if they densify back around their old cores and waterfronts. They are products, largely, of the 20th-century cheap energy fiesta and they will be starved in the decades ahead.