Don Paul, Chevron's CTO says that
The "geological endowment" of conventional oil--that is, the amount of oil in the Earth--once totaled about 3 trillion barrels, he said during a presentation at the Dow Jones Alternative Energy Innovations conference here. We've used about 1.1 trillion. Oil companies with current technologies can't get it all out of the ground, so maybe there is a trillion barrels left for human consumption....Thus, peak oil--the theory that we're about to get into declining numbers on conventional oil--is probably real. However, Paul said, "I don't think it has to be the catastrophe that other people have predicted because there are other ways to make fuel."
Paul is the first big oil industry representative I've heard say this.One way to mitigate the increasing cost of energy is to build energy-efficient cities and towns that help people get around without depending so much on cars.