Chinese authorities battled…to contain an oilspill on the country's northeast coast…China National Petroleum…owner of the pipelines that exploded, said in a statement…that at least 400 tonnes of the spilt oil had been cleaned up…The area...has a major fishing industry, but catches had been banned for now…Zhao Zhangyuan, a researcher with the China Environmental Science Research Institute…[said] the impact on marine life and on humans -- as the pollution enters the food chain -- could last 10 years. "The most critical impact is on human health. As the oil decomposes, substances that are produced, many of them carcinogenic, can cause serious ecological damage," he was quoted as saying…