This past May, in an unheralded and almost unnoticed move, the Energy Department signaled a fundamental, near epochal shift in US and indeed world history: we are nearing the end of the Petroleum Age and have entered the Age of Insufficiency. The department stopped talking about "oil" in its projections of future petroleum availability and began speaking of "liquids." The global output of "liquids," the department indicated, would rise from 84 million barrels of oil equivalent (mboe) per day in 2005 to a projected 117.7 mboe in 2030--barely enough to satisfy anticipated world demand of 117.6 mboe. Aside from suggesting the degree to which oil companies have ceased being mere suppliers of petroleum and are now purveyors of a wide variety of liquid products--including synthetic fuels derived from natural gas, corn, coal and other substances--this change hints at something more fundamental: we have entered a new era of intensified energy competition and growing reliance on the use of force to protect overseas sources of petroleum.

To appreciate the nature of the change, it is useful to probe a bit deeper into the Energy Department's curious terminology. "Liquids," the department explains in its International Energy Outlook for 2007, encompasses "conventional" petroleum as well as "unconventional" liquids--notably tar sands (bitumen), oil shale, biofuels, coal-to-liquids and gas-to-liquids. Once a relatively insignificant component of the energy business, these fuels have come to assume much greater importance as the output of conventional petroleum has faltered. Indeed, the Energy Department projects that unconventional liquids production will jump from a mere 2.4 mboe per day in 2005 to 10.5 in 2030, a fourfold increase. But the real story is not the impressive growth in unconventional fuels but the stagnation in conventional oil output. Looked at from this perspective, it is hard to escape the conclusion that the switch from "oil" to "liquids" in the department's terminology is a not so subtle attempt to disguise the fact that worldwide oil production is at or near its peak capacity and that we can soon expect a downturn in the global availability of conventional petroleum.

Petroleum is, of course, a finite substance, and geologists have long warned of its ultimate disappearance. The extraction of oil, like that of other nonrenewable resources, will follow a parabolic curve over time. Production rises quickly at first and then gradually slows until approximately half the original supply has been exhausted; at that point, a peak in sustainable output is attained and production begins an irreversible decline until it becomes too expensive to lift what little remains. Most oil geologists believe we have already reached the midway point in the depletion of the world's original petroleum inheritance and so are nearing a peak in global output; the only real debate is over how close we have come to that point, with some experts claiming we are at the peak now and others saying it is still a few years or maybe a decade away.

Until very recently, Energy Department analysts were firmly in the camp of those wild-eyed optimists who claimed that peak oil was so far in the future that we didn't really need to give it much thought. Putting aside the science of the matter, the promulgation of such a rose-colored view obviated any need to advocate improvements in automobile fuel efficiency or to accelerate progress on the development of alternative fuels. Given White House priorities, it is hardly surprising that this view prevailed in Washington.

In just the past six months, however, the signs of an imminent peak in conventional oil production have become impossible even for conservative industry analysts to ignore. These have come from the take-no-prisoners world of oil pricing and deal-making, on the one hand, and the analysis of international energy experts, on the other.

Most dramatic, perhaps, has been the spectacular rise in oil prices. The price of light, sweet crude crossed the longstanding psychological barrier of $80 per barrel on the New York Mercantile Exchange for the first time in September, and has since risen to as high as $90. Many reasons have been cited for the rise in crude prices, including unrest in Nigeria's oil-producing Delta region, pipeline sabotage in Mexico, increased hurricane activity in the Gulf of Mexico and fears of Turkish attacks on Kurdish guerrilla sanctuaries in Iraq. But the underlying reality is that most oil-producing countries are pumping at maximum capacity and finding it increasingly difficult to boost production in the face of rising international demand.

Even a decision by the Organization of the Petroleum Exporting Countries (OPEC) to boost production by 500,000 barrels per day failed to halt the upward momentum in prices. Concerned that an excessive rise in oil costs would trigger a worldwide recession and lower demand for their products, the OPEC countries agreed to increase their combined output at a meeting in Vienna on September 11. "We think that the market is a little bit high," explained Kuwait's acting oil minister, Mohammad al-Olaim. But the move did little to slow the rise in prices. Clearly, OPEC would have to undertake a much larger production increase to alter the market environment, and it is not at all clear that its members possess the capacity to do that--now or in the future.

A warning sign of another sort was provided by Kazakhstan's August decision to suspend development of the giant Kashagan oil region in its sector of the Caspian Sea, first initiated by a consortium of Western firms in the late '90s. Kashagan was said to be the most promising oil project since the discovery of oil in Alaska's Prudhoe Bay in the late '60s. But the enterprise has encountered enormous technical problems and has yet to produce a barrel of oil. Frustrated by a failure to see any economic benefits from the project, the Kazakh government has cited environmental risks and cost overruns to justify suspending operations and demanding a greater say in the project.

Like the dramatic rise in oil prices, the Kashagan episode is an indication of the oil industry's growing difficulties in its efforts to boost production in the face of rising demand. "All the oil companies are struggling to grow production," Peter Hitchens of Teather & Greenwood brokerage told the Wall Street Journal in July. "It's becoming more and more difficult to bring projects in on time and on budget."

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