Human muscle as an energy source has always been a terribly inefficient prospect. That's why we literally started moving away from it in 7000 BCE.
Gravitational potential energy will probably be our best bet for energy storage, but we will be using appropriate-tech solar and biomass and wind and hydro (probably in that order) to charge it.
Further reading:
https://www.lowtechmagazine.com/2017/05/could-we-run-modern-society-on-human-power-alone.html
Human muscle as an energy source has always been a terribly inefficient prospect. That's why we literally started moving away from it in 7000 BCE.
Gravitational potential energy will probably be our best bet for energy storage, but we will be using appropriate-tech solar and biomass and wind and hydro (probably in that order) to charge it.
Further reading: https://www.lowtechmagazine.com/2017/05/could-we-run-modern-society-on-human-power-alone.html
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Have you ever used one of those hand-powered crank flashlights?
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From my experience, I'm pretty sure no one uses the hand-powered ones more than once or twice before getting sick of them.