Guardian: Polluters in China are operating in a “black box” of secrecy, the Ministry of Environmental Protection has warned amid a rash of violent protests related to industrial poisoning. Offenders are protected by the vast majority of local authorities defying Beijing and violating state law by refusing to disclose information about pollution, with a study showing just 4 out of 113 local governments complied. The ministry said this lack of transparency was partly to blame for recent …