China's coal heartland fighting for a greener future

Deep in the recesses of an underground cavern, covered in dust and soot, Xu Xiaobo wondered why, having recently graduated with a degree in mechanics, he was on his hands and knees sifting through layers of coal sludge. But there was no time to ponder the ancestral forces that had brought him down into one of his province's oldest mines. There was coal to dig for. New to the job, keeping up with colleagues was challenging. As he tried to crawl at speed under a conveyor belt of coal, he landed badly and sprained his wrist. He still can't rotate…