Tensions grow as China ramps up global mining for green tech

Earlier this year, Ai Qing was woken up in the middle of the night by angry chants outside her dormitory in northern Argentina. She peered out of the window to see Argentine workers surrounding the compound and blockading the entrance with flaming tyres. "It was getting scary because I could see the sky being lit up by the fire. It had become a riot," says Ms Ai, who works for a Chinese company