Chinese negotiators attending this week’s climate change talks in Lima have come armed with a long and detailed list of measures to rein in the coal use that creates smog at home and climate change worries abroad. Early this month President Xi Jinping unveiled an estimate that China’s greenhouse gases would stop climbing in about 2030, thanks to policies restricting coal use around big cities in the east. More On this story On this topic IN China But there’s a wild card in the carefully tabulated spreadsheets of boilers to be shut and pipes to be laid. Emissions from an industry that transforms coal into gas or liquid fuel are proving difficult to measure and […]