McClatchy Newspapers: BEIJING The burning Shuixi Gou coalfield in far western China is terrible for the environment, belching smoke and noxious gases. Some experts look at the fire, however, and see hope for progress against global warming. That’s because the burning coalfield in western Xinjiang province may not be that hard to put out. So it’s become a guinea pig of sorts for the notion that big polluters in other parts of the world might pay to fix environmental problems in countries such as …