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rst and green development. 
Environmental protection factory farming solves the pollution of excrements of livestock through two methods. Firstly, it treats the excrements of livestock as organic manure which not only could reduce the product cost of using chemical fertilizer but also works out the pollution of feces to environment to promote the development of green food and organic food. The excrements of livestock is superior organic fertilizer as it contains a large number of organic matter and nutrient substance that needs by crop growth such as nitrogen, phosphorus, and kalium (Davidson, 2004). Second, environmental protection factory farming solve the pollution of the excrements of livestock through marsh gas production. It changes the excrements of livestock into superior liquid state biogas slurry and clean fuel marsh gas. Biogas slurry could be used to produce pollution-free agricultural products and marsh gas could sell to nearby residents or others. Those not only could solve pollution problem of factory farming but also bring about certain economic performance. 

Business Environment商业环境

For the political environment, at present, it puts forward high environmental requirement in the world and most countries and areas advocate adopting sustainable utilization mode about natural resource during the economic and social development. Most countries and areas focus on build and achieve sustainable development mode about agriculture and food industry (Van Calker et al, 2005). As a result, the government in many countries and areas formulate relative policies to promote strategically adjustment of agricultural structure to achieve sustainable development of agriculture industry. The relative policy mainly focuses on avoid the pollution of factory farming to environment and pays high attention to protect the ecological environment and this kind of policy is helpful to promote the development of environmental protection factory farming effectively (Kirby, 2010). Thus, the political environment is positive to the development of environmental protection factory farming. 
For the technologic environment, there are a multitude of scholars and relative technicist pay high attention to research and develop environmental protection factory farming. Government also encourages the relative research and development of environmental protection factory farming. For example, in recent years, researcher has discovers the fermentation bed technology which is environmental protection, energy conservation, cleaning, and sustainable development organic ecological breeding technology (Van Calker et al, 2005). This kind of technology reduces environment pollution, reduces farming expenses, and is helpful to increase product quality which could improve farming performance. Thus, the technological environment also supports the development of environmental protection factory farming.   
For the economic environment, as the continuously improvement of human being’s living standard and the increasingly paying high attention to environmental issue in the world, the business idea of environmental protection factory farming is paid attention by enterprise and government step by step and it has rapid development in recent years. As the rapid development of economic globalization and economic integration, global economy also obta本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。