A group of 17 elements make up a little-known group called rare earth metals. They are notoriously tricky to extract, which is unfortunate since they’re key components in smartphones, batteries, motors, and wind turbines, and essential to a clean-energy future. China has a near monopoly on the mining and processing of rare earth metals, but as demand for them rises, other countries are looking to get into the game.Photo by Eric Helgas; styling by Alex Citrin-SafadiTranscript: https://qz.com/2062525