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that's ridiculous. The world uses 85 million barrels of oil the world uses in a day. The known reserves will last just 53 years at the current rate. Certainly there is more oil that isn't known about, but that amount is finite. Unless brand new oil is being created at a rate of more than 85 million barrels a day, we'll eventually run out.
Sheesh, I would have expected this from some others, but not from you. Also, it's a bit frustrating when you cite facts with no links, because the context is lost.
In any case, here is the SEC definition of "proved reserves" which I assume is what you're "known reserves" figure is, though I can't be sure because you didn't provide a link.. Anyway, the definition is iimportant:
“Proved oil and gas reserves are those quantities of oil and gas, which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible–from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and government regulations.”
http://oilindependents.org/oil-and-natural-gas-reserves-definitions-matter/
The obvious point is that this is not a static number. As economic conditions, operating methods, and government regulations change, that number changes as well. You can go back and find plenty of other "known" (or proven) reserve projections saying that we should already have run out.
But forgetting the definition for a moment, the critical point is that oil reserves generally become more and more expensive to recover as the more accessible/usable oil is recovered. The less oil there is, the more expensive it will be to recover. So there will undoubtedly come a point where the cost of extracting oil for use as a fuel will become economically unfeasible. At that point, while there is still petroleum in the ground, we will stop using it as fuel. And it's also very likely that conservation will become more widespread as the cost rises as well.
Now, assuming that no suitable, economically--feasible substitute for non-fuel uses has been discovered by then, we will likely continue extracting petroleum for non-fuel uses at that point. But, the same analysis eventually holds. At some point, while there is still petroleum in the ground, we will stop using it for non-fuel purposes because it will become economically unfeasible.
That's why I said that we will never run out of petroleum. It's a basic point of economics that's crucial to understand in the whole debate about "running out of oil" and alternative energy sources. The inevitable and predictable rising costs of producing petroleum-based fuels will mean that we will be forced to begin a shift to alternatives. And what happens is that alternatives that previously were too expensive and economically inefficient because of the price of petroleum will gradually become a better choice over time as the cost of petroleum rises.
So you basically have two curves: the cost of petroleum increasing (generally) over time, and the costs of various alternatives. And those alternatives themselves will have their own curves, as advances in technology and the need to use less-than ideal locations for some alternatives affect price/cost.
But the point is that "running out of oil" is not some cliff. It is a curve that will be controlled by economic efficiencies.