Composting toilets have been a thing for a very long time: https://www.motherearthnews.com/diy/compost-toilet-zm0z19jjzbut/ https://www.motherearthnews.com/diy/

Composting toilets have been a thing for a very long time: https://www.motherearthnews.com/diy/compost-toilet-zm0z19jjzbut/ https://www.motherearthnews.com/diy/compost-toilet-zm0z19jjz... But yeah, scaling it up massively is the trick: https://www.oursoil.org/food-tank-soil-transform-human-waste-into-compost-in-haiti/ https://www.oursoil.org/food-tank-soil-transform-human-waste...