Spiegel: Germany is pinning its economic hopes on future-oriented industries such as solar panel manufacturing. But high-tech companies are facing shortages of essential metals as China, which dominates the world market in so-called rare earths, begins stockpiling the highly sought-after resources. A massive gray mountain rises from the vast plains of Inner Mongolia. The artificial hill is the pride of the Chinese and the envy of the world — at least the world of commodities …