hink high gas prices are bad? Get a load of what ex-oilman and ex-Princeton professor Kenneth Deffeyes believes are following closely behind: "War, famine, pestilence and death," he said. "We've got to get the warning out." The threat? Peak oil. The term refers to the time when the worldwide production of oil peaks and begins a rapid decline. From then on, this incredibly efficient fuel source, which still costs less than most bottled water, will be ever more scarce and ever more costly. Highly respected sources, including the U.S. government, think that day is distant, and most mainstream economists think...