How Rare Earths (What?) Could Be Crucial in a U.S.-China Trade War

And in one of its more strategic weapons, Beijing could use its dominance to cut off key parts of the global supply chain. China is the major supplier of a number of mundane but crucial materials and components needed to keep the world’s factories humming. They include obscure materials like arsenic metals, used to make semiconductors; cadmium, found in rechargeable batteries; and tungsten, found in light bulbs and heating elements.

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