If oil prices are high enough for a long enough period of time other sources come on-line. Diesel invented his engine to run on peanut oil, but yes, geling at low tempertaturs, not to mention where do you get that much veg oil! is a big question. At high oil prices, coal-gasification (a technology used in Germany durring WWII) also works, and we have plenty of coal. In additon, extraction of oil from shale and sands also works at high oil prices. If oil stays at these levels people will invest and bring prices back in line
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