Yinchuan – In a wetland park on the edge of the Maowusu Desert in northwest China, birds circle above the water and reeds sway along the shoreline. Few visitors would know that the wetland is a product of the coal industry – created with water pumped out of nearby mines.For local residents, the 21,000-mu (1,400-hectare) green space is perhaps the most visible symbol of how Ningxia Hui Autonomous...