It turns out we had our 'free energy' the whole time and look what we did with it. (Why do they call it 'rolling coal' when it's made from diesel?)
Sea water contains everything. Nano-scale porous membranes will separate them, something we could never do before Buckminsterfullerine. It's also something we could choose not to do now. We should choose wisely.
edit:
Can't sleep, thinking about what I'd said. Mercury isn't immiscible in seawater. That's why it goes straight to the fats in fish. There may be others.
Quote:
Phosphate Cycle
Phosphorus occurs naturally in rocks and other mineral deposits. During the natural process of weathering, the rocks gradually release the phosphorus as phosphate ions which are soluble in water and the mineralize phosphate compounds breakdown.
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https://www.water-research.net/index...phate-in-water