In this articleMPA stack of old mobile phones are seen before recycling process in Kocaeli, Turkiye on October 14, 2024. Anadolu | Anadolu | Getty ImagesAs the U.S. and China vie for economic, technological and geopolitical supremacy, the critical elements and metals embedded in technology from consumer to industrial and military markets have become a pawn in the wider conflict. That's nowhere more so the case than in China's leverage over the rare earth metals supply chain. This past week, the Department o ...