Our society cannot survive without a cheap supply of minerals; so, it may not be too early to look for new sources.
If mines on land are gradually becoming depleted, could the oceans become our new mines? There have been several proposals for mining the oceans' floor, but that is just an extension of conventional mining and, besides, the task has proved to be complex and expensive. The real change of paradigm, instead, is in extracting ions dissolved in seawater.
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