One interesting thing from Geoffrey West's Scale: the whole human body uses 90 Watts. That's like a crappy lightbulb. Nature is efficient. Artificial things are nowhere near it.
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No it adds up. You eat ~2k calories a day which is ~2300 watt hour ~= 90 watt * 24 hours. Watt measures all types of energy, not just electricity. 90W Lightbulbs of course are extremely inefficient, but still.
