While I suppose that most of the carbon in America's favorite fossil
fuel is botanical in origin, it's easier to get a gut feel for unrenewability by considering dinosaurs.
So to be more specific, if you estimate the number of carbon atoms in one full-grown adult tyrannosaur, what volume of 92 octane gasoline would that represent? And conversely, how many dinosaurs could you build out of the carbon in one gallon of gas?

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