Wall Street Journal: The International Energy Agency warned that China must clean up its coal sector or face dire environmental consequences for itself and the world. The Paris-based body outlined steps to mitigate pollution in China, including tougher enforcement of regulations, more foreign investment in energy, and putting a price on carbon emissions. [China Coal photo] Reuters A miner works at a coal mine in Changzhi, Shanxi province. “Without strong action, CO2 emissions could rise …