Ghost slaves

If the energy provided by the fossil fuel to support the average inhabitant of the US had to be produced by human power, we would each have 120 slaves.

— cit. Weston Price, Nutrition and Physical Degeneration, 2000, p.4.

I forget where I found the phrase “ghost slaves” to describe this idea, but it helped me get my head around some more radical criticisms of agriculture and civilization.