SOME of the greenest technologies of our time - from electric cars to efficient light bulbs to large wind turbines - are made possible by a group of unusual elements called rare earths. The world's dependence on these substances is rising fast.
Just one problem - these elements come almost entirely from some of China's most environmentally damaging mines, in an industry dominated by criminal gangs.
Western capitals are suddenly worried about China's near monopoly, which gives it a potential stranglehold on technologies of the future.
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