What a lot of peakist don't understand is that the most important attribute of hydrocarbons is energy density not energy efficiency. If we expend more energy extracting hydrocarbons for jet fuel for instance than we get from burning it that's fine as long as 1) the extra energy we expends comes from an abundant and cheap source like future PV solar and 2) those hydrocarbons are used in an economically useful fashion like air travel. Peakists seem to fall prey to the belief that the earth is a closed system, instead of an open system powered by the sun.
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