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The United States hit peak oil production in 1970. Depending on your sources, we may have already passed global peak production or we may not reach the downslope in for a few more years. Still, even if the amount of fuel being pumped out of the Earth has crested, surely all those new four-wheel vehicles being added in Asia alone is enough to guarantee that global use of cars is still on the rise.

While the debate over peak oil rages on, a new yardstick has emerged: "peak travel."