I guess I don't really get it. Earth, the planet, is finite in mass and not all of that mass exists in the form of crude oil or equivalent raw sources of petroleum. Therefore there will be a point at which no further oil can be obtained. One is of course free to debate when that point will come, or when the inevitable decline toward that point begins, but the simple fact remains that a finite resource is, well, finit…
So, yes, the author concedes that the supply of oil is finite. But he is arguing that "Peak Oil" is much less imminent than many claim. Specifically, that there is an extra 1.5 trillion barrels of recoverable oil that "peak-oil advocates" do not account for. I would like to see a peak-oil advocate's take on these numbers.