A car is far from the only consumer of petroleum. Many electrical grids directly use hydrocarbons, construction uses petroleum, public transportation uses petroleum, local shipping uses petroleum, overseas shipping uses petroleum, manufacturing uses petroleum, plastic is made from petroleum, farms run on petroleum... Sure, most of those industries are trying to convert energy sources, but in no way can an individual avoid petroleum consumption and still live. Avoiding windows and Adobe is less insurmountable, but still a powerful stressor for people just trying to make a living.