Wind and sun may be nearly infinite resources. But the materials needed to build wind turbines and solar panels are not always common. Take the rare earth metals—neodymium, dysprosium, and praseodymium—for example. Chances are those names are just as unfamiliar as the silvery metals they represent. And yet, some wind turbines cannot function without them. Solar power also relies on a diverse list of materials—from aluminum to zinc—to convert sunlight to electricity.
