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@helenczerski I suspect most people don’t really appreciate how dilute ocean resources are, and how much collateral destruction their mining would involve.
Take your analogy, you can get the kg of calcium by destroying the surrounding 100kg of person.
For seabed deposits, what if you have to ruin 10,000 kg of seabed, 100,000 kg of seawater, and a million living things to get your kg of manganese?