?Meanwhile back in reality....
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Increased population means that more land will be used for housing, farming, consumption of raw materials such as lumber, cattle, etc... That translates into less foliage that would eventually be converted into petroleum.
Considering it takes, generally, over a million years for living matter to be converted naturally into oil, current and future land usage is not even remotely relevant to future oil production or the total available reserves we can tap into. All that matters is the current conversion rate, how much of that is accessible and if we are exceeding that rate. Most of this is unknown though.