The viability of a renewable energy future relies on the ready supply of REEs, or rare-earth elements. There are 17 REEs in the periodic table and, though the name suggests otherwise, they are actually plentiful in the earth’s crust. The challenge is that these elements are not often concentrated in ore deposits, which makes them expensive and unreliable as an extractable resource for domestic use or export. This in part explains the shortage of these materials being extracted in the United States READ HERE
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