Residents of a city in southern China are rushing to buy bottled water after excessive levels of the carcinogen cadmium were found in a river source of drinking water, state media said Thursday the latest health scare to hit the country. Pollution of waterways by toxic run-offs from factories and farms is a pressing issue in China, prompting the authorities to call for policy tightening to cut pollution by heavy metals, but the problem shows no sign of leaving. (more…)