Dozens of people are feared dead after a mining company's dam burst in the southeastern Brazilian state of Minas Gerais on Thursday, sending a cascade of muddy water into the small village below, local media say.

This toxic lake is what's left behind after making the magnets for Britain's latest wind turbines... and, as a special Live investigation reveals, is merely one of a multitude of environmental sins committed in the name of our new green Jerusalem.

Hidden in an unknown corner of Inner Mongolia is a toxic, nightmarish lake created by our thirst for smartphones, consumer gadgets and green tech, discovers Tim Maughan.

- BBC Future

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