When I see nature bulldozed to build subdivisions, I feel anger toward the developers. But when I drive by later and see the new homes filled with families, my anger goes flaccid. Must not the families live somewhere? True, they had homes before, but those homes now house others, and the others' old homes house others too. Trace the trail of new construction back to its origin, and you arrive at a hospital maternity ward humming like a factory day and night, sending endless swaddled shipments of future homebuyers into the world. Developers build because parents beget. Suburbs sprawl because lovers do.