"Both the mining and the washing [of hydrocarbons] require huge amounts of energy, and it has been proposed that any commercial exploitation of the Alberta tar sands would take 20 percent of Canada’s total natural gas production. In the long run, it might not be worth expending the energy from gas to get the energy from the tar sands. If oil from the tar sands themselves were used to process more tar sands, the return would be three barrels of oil for every two consumed. […] In the early days of conventional oil in Texas, the formula was very favorable, around twenty to one. The oil was found close to the surface on dry land in temperate places easy to work in, and it gushed out of the ground under its own pressure. […] Going a bit further, the fundamental equations that support all gigantic… organisms, …may no longer obtain, and human life would have to reorganize its activities on a different basis. Also, once these complex systems and their subsystems halt their operations, restarting them may range from difficult to impossible […]."
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Chapter 3, p. 108.
https://en.wikiquote.org/wiki/The_Long_Emergency
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The Long Emergency
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