As U.S. President Biden nears the end of his term, there’s one little-known metal whose scarcity is keeping him up at night even today. And analysts warn that President-elect Donald Trump is likely to inherit this headache too. The metal is not gold, silver, or uranium. It’s not the lithium used for EV batteries. It’s not the copper that is essential for electrification. It’s not even the rare earth elements that are crucial for everything from smartphones to wind turbines. This metal has a global annual production…