Originally posted by: Howard
Originally posted by: jjones
Originally posted by: AnyMal
Actually, of all the plot's twists and turns this on made sense to me. It is true, humans produce a certain amount of BTU's which theoretically can be converted into energy. Using humans as the energy source requires much less "manufacturing" effort (self-reproduction) and upkeep (feeding tubes) and a single pair of humans can reproduce dozens of times over the lifetime.
Just my theory
Well, I don't know how good of an energy source we are, but it seems like the machines would expend much more energy in producing and maintaining humans than they would get in return. I mean they have all of mother earth to use as an energy resource without any environmental concerns whatsoever. I would think they would dispense with humans altogether, but then there wouldn't be a movie.
Whatever energy we would be able to produce (assuming a possible method of extraction) would have be first extracted from the food we eat. Of course, this is not a perfectly efficient process, so they would never even come close to breaking even.
Where does all the food come from, anyway? There's no sunlight, so either the food is chemically generated, which requires another source of energy... or sunlight is artifically produced, which again requires a source of energy, most likely electricity. Wind, nuclear, geothermal, fossil etc. power are viable, but none of these are mentioned in the films IIRC.