I have been reading about the peak oil situation - that this is the year of maximum oil production, it's all downhill from here. Certainly seems to makes sense these days with fuel prices so high and no sign of them coming down (not owning a car, this particular problem does not bother me too much). Since transportation uses so much of the oil that we have/import, this article about what vehicles or services might be first on the list in an oil shortage compared to the current #1 user, the single occupancy vehicle:

If we had to rank essential uses for oil, transporting a single person to work would have to fall somewhere near the bottom. At the top would be fueling the tractors that plant and harvest our food. Food transport trucks, and a long list of other kinds of trucks and buses, would be listed before we get to the family car. (Courtesy of Peak Oil News)