May 2006· Today the world is using 40,000 gallons of oil a second. We use it in our cars, trucks, buses, boats, planes, and trains. We use it to power equipment. We rely on it not only for transportation, but also for food, warmth, and water. A day without oil is unimaginable. And yet we must begin to contemplate it. We are running out. The question is: how much is left?