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A few facts, oil discoveries have been declining since the 1960s. ANWR, which everyone seems to tout as a savior contains 300 days or so of oil, at current consumption levels, for the United States alone. That is about the average size for fields found nowadays.
Unconventional sources happen to be impossible to extract at anything approaching an efficient level, and there is no technology on the horizon to change that. For tar sands or oil shale, it takes more energy to extract the oil than what is produced by the end product. This changes oil from a source of energy to an energy carrier, similar to hydrogen or batteries.
I'm reminded of a speech and Q/A section I saw from John Perkins, the guy who wrote "Confessions of an Economic Hitman". Well, most of the stuff he was talking about was interesting, then, during the Q/A section, one of the audience mentioned Peak Oil and asked if that had any economic consequences on an international level. John Perkins responded by saying its not a problem because "oil can be made from anything, even this podium." I really wanted to scream at him for spouting such ignorance. Of course, ANYTHING organic can be made into complex hydrocarbons, basically oil, but he has no fucking clue how much energy it takes to do it. He's good at analyzing some aspects of economics, but fails at science, with a big fucking F.
The fact of the matter is that negative consequences to Peak Oil don't have to occur on the "downward slope" as you put it, but at the peak itself. All you need is for oil production to remain static to plunge the world economy into a recession, and the downward slope on the other side is for the depression that will follow.
The biggest problem is time, right now, our primary means of transportation is based on oil, whether we are traveling by land, sea, or air. More than that, oil is the basis for the "Green Revolution" which allowed for 6+ billion people to live on this planet and be able to survive. Whole crop strains have been bred and, more recently, engineered to take advantage of Oil based fertilizers, tolerance for oil based pesticides and herbicides, etc. The prices at the gas pumps are only a part of the reason why bread prices have been increasing.
The fact is that there is even if we listen to the optimists, with there "undulating plateau" theory, that's the oil company line, by the way. There would still be serious consequences for the world, and we don't have the time necessary to wean ourselves off the oil teat without some disruption in our lives. The oil shocks of the 1970s are going to be nothing compared to this.
As far as who is advocating the theory, remember, for the longest time, it was mostly geologists, most in the oil industry, who said there was a problem, and they were ignored, and some vilified, by that same industry. That's only changed in the past few years as the evidence for peak oil has become too large to ignore. Besides that, regardless of who advocates for the theory, the fact is that the evidence supporting it is adding up. Its becoming to obvious to ignore much longer, the only question is what we should do about it.
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