Peak Oil

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A hypothetical date referring to the world's peak crude oil
production, whereby following this day, production rates will
begin to diminish. This concept is derived from geophysicist
Marion King Hubbert's "peak theory", which proclaims that oil
production follows a bell-shaped curve.


Investopedia Says:
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Because oil is a non-replenishing resource, there is a
limit to how much the world can extract and refine. Peak
oil is the day that oil production reaches a maximum and
will subsequently begin to decline until full depletion is
ultimately reached.