Humans don’t produce much oil and the energy wee need in the form of food to produce it is not used efficiently.
If you were to set up a farm full of humans to harvest them for their oil you would have to feed them and then you would spend more energy growing, gathering and transporting the food to the humans than you would get out of burning the little oil they produce.
It works with whale oil because whales are bigger than humans and you don’t need to feed them before you capture and kill them and gathering a single whale is easier than gathering up all the plankton the whale ate and using that for fuel instead.
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