Technology
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The other real tradeoff is that it doesn't rely on rare earth materials in order to function. Sodium is incredibly abundant and can easily be filtered out of seawater for all the world's needs for the next thousand years.
It's also theoretically less toxic and less likely to explode, and even though for now it costs more than lithium, what with lithium having had 20-some odd years of development behind it, the price will come down because the raw materials to make it are abundant and cheap.
it just ocurred to me. could this be done on desalination plants for drinkable water? how much sodium are we talking about here?