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I'm convinced R.Tarrach had this answer in mind when he was writing that text.
energy output of over 12 MJ. As to why it costs so much to eat, I guess if
we could injest coal or natural gas, we could 'fuel' ourselves a lot
cheaper. There is much more time, effort, and cost involved in growing and
processing our normal food-stuffs than to 'mine' the fuels of commercial
electrical energy.
Rick