this is a good question https://twitter.com/VividVoid_/status/1403398398258995205?s=20 …
we didn't have enough water power for this. it took over a mile of pipe run downhill to get enough pressure for the Pelton wheel and we still couldn't run power tools
oh, and the water started to dry up in 2013 






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At those scales nutrient recycling will need to be maximized (esp P & Fe; nitrogen fixers can be cultivated so N isn’t an issue). That can likely be high enough that only exported nutrients need to be replaced. Capturing nutrients discharged into the ocean via rivers 1/
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would be an additional ecological service till changes in terrestrial agriculture reduce that problem. 2/2
End of conversation
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Though the other point I’ll make is that the required R&D is mainly process/system integration. It could be implemented using mainly 1970s or older technology, though of course it will be better optimized using more advanced/recent tech.
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