I would love to specially engineer a solar or low power etherium miner. I think even if it took two decades to mine one, then having hundreds in parallel may be an interesting investment.
Or design an etherium bouy that just was 1 unit soaking up the oceans energy. Imagine a little patch out in the south sea. Not really big enough to get noticed. Doing its thing.
Ya'll some good ideas here.
Might be cheaper to crack hydrocarbons directly into food, gasoline straight from the atmosphere in the long run tho than buying it with etherium.
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