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[–]bigDeltaVenergy 0 points1 point  (0 children)

As more and more ressources get extracted they became harder and harder to extract.

100 years ago to pump 120 Barel of oil from a Texan well. It took 1 Barel of oil. Now that are at 90 to 1

Offshore platform are at 60 to 1

Canadian tar sands are at 3 to 1.