for reading
The world may possess large reserves but I am not convinced the reserves will be mined at least not from countries with reasonable environmental constraints. The countries that mine the rare earths may form a cartel to fleece the rest of the world. In addition, the article treats the REE as a group but there are 17 elements, some of which may be in scarce supply.
Regardless of the demand/supply situation, developing rare earths is dirty business, as dirty (perhaps much dirtier) than conventional energy sources. There is nothing clean in the fraudulent claims of green energy.