Reuters: China’s controversial railway to the remote and restless mountainous region of Tibet could be threatened by global warming, which may melt the permafrost on which the tracks are built, state media said Wednesday. “In Tibet, the mercury has climbed an average of 0.32 degrees Celsius every decade since records began in 1961,” China Meteorological Administration head Zheng Guoguang was quoted as saying by the official Xinhua news agency. “This is much higher than the national …