In order to make the "loess" to reappear the blue sky and water, the four big projects of environment named "blue sky, green water, greenery and bright sun" are formally started in Shaanxi Province.

Blue-sky project or the urban natural gas project means to promote the usage of natural gas in ten prefectures or cities and part of the county-level cities. It aims to improve the urban industry and living fuel structure and air quality. The blue water project includes the comprehensive treatment of Weihe River. 23 sewage and wastewater treatment plants and 18 solid waste treatment plants will be established in six cities, including Xi'an, Baoji, Xianyang, Weinan, Tongchuan and Yangling. The greenery project or the ecological protection project consists of the four-class network of ecological demonstrative cities, counties, townships and villages, the construction of 34 natural reserves, the construction of Qinling Mountain biodiversity protection project, the returning farmland to forest and grass in the water source protection areas of the province...