• So long as oil is used as a source of energy, when the energy cost of recovering a barrel of oil becomes greater than the energy content of the oil, production will cease no matter what the monetary price may be.

    M. King Hubbert: So long as oil is used as a source of energy, when
 the energy cost of recovering a barrel of oil becomes
 greater than the energy content of the oil, production
 will cease no matter what the monetary price may
 be.
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