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China’s fermentable waste mainly consists of the following components: 1. China produces 600-700 million tons of crop straws each year; in the past, these were primarily used as fuel for household use, with a small portion being used as feed for livestock and in paper production. As living standards in rural areas improve, the fuel used by rural households has gradually shifted to natural gas, liquefied petroleum gas, and coal. The paper industry, facing serious environmental pollution issues resulting from the use of straw, has turned to wood pulp, which has led to an increasing amount of leftover crop straw; it is estimated that this amount reaches around 400 million tons per year. Apart from being composted or used directly as fertilizer, most of it is burned. In some areas, the problem of burning crop straws has become extremely serious; it not only pollutes the environment but also affects airplane landings and vehicle traffic on highways. 2. China’s livestock industry also generates over one billion tons of livestock manure each year. As China has shifted from scattered farming by individual households in the past to centralized farming near large cities, the disposal of livestock and poultry manure has become a significant environmental burden for farms; if not managed properly, it can even lead to serious contamination of groundwater sources. 3. The amount of fermentable waste in Chinese cities (such as kitchen waste, by-products from food processing, and leftovers from vegetable trading) is increasing year by year. In large cities like Beijing, Shanghai, Tianjin, and Shenzhen, the volume of such waste reaches hundreds of thousands of tons per year. Instead of being used as fertilizer, it occupies valuable land designated for landfills; in some places, it even poses a serious risk of landfill explosions and causes severe wastewater problems. In line with China’s commitments at the 2008 Beijing Olympics, China encourages the vigorous development of advanced large-scale biogas production technologies as a renewable energy source. It is foreseeable that the widespread adoption of intermittent dry anaerobic biogas fermentation technology will enable the use of biogas as an alternative to coal in small and medium-sized towns as well as in rural areas. This will improve the quality of life in rural regions, increase the income of farmers and enterprises in those areas, **reduce air pollution caused by the burning of straw, and, as a renewable energy source, significantly cut carbon dioxide emissions into the atmosphere