ERDOS, China -- Shenhua Group Corp., one of China's coal giants, has built much of its success at the cost of climate change. Every year, the company digs hundreds of million of tons of coal out of the ground and sells this carbon-intensive energy source throughout China. Meanwhile, its own plants consume a few million tons to generate power and chemicals, releasing a massive amount of climate-harming gas into the air. But now, Shenhua is shifting its course. The clue is hidden in a coal-to-liquids plant here, deep in northern China's Gobi Desert.