AFP: China’s coal-fired plants produce enough toxic ash to fill an Olympic-sized swimming pool every two-and-a-half minutes, creating contaminants that travel far and wide, Greenpeace said Wednesday. As the world’s largest coal user, China’s more than 1,400 coal-fired electrical plants produce at least 375 million tonnes of coal ash every year — 2.5 times the quantity in 2002, the environmental group said. “Every four tonnes of coal burnt produce one tonne of coal ash,” Yang Ailun, …