TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: If organic garbage generated in markets, supermarkets, and restaurants and contains water and is difficult to be burned (e.g. seedcase, vegetable, and fish and meat), is buried by traditional method, valuable resources are wasted and causing serious pollution. If it is burned, the process is difficult and costly, and further generates certain pollution. In the method, the garbage is used to generate firedamp, where the garbage is changed into energy sources. Firedamp generators such as movable case type firedamp generators are built beside fuel power plants and garbage burning plants. During epidemic situation, many birds and livestock are killed, which are collected and used to generate firedamp. The firedamp is directly used to generate electricity. In certain industries, waste engine oil, waste lubricant, or waster water containing oil is discharged by some factories in isolated places in the mountains, which causes serious pollution and wasting energy sources. In this method, the factories are required by the government to recover waste oil and waste water, treating the waste oil and waste water, and burned to generate electricity. The garbage that is not capable as energy source, such as waste discs, waste glass, and pollutant batteries and nearly all non-mud garbage which is not capable of giving out heat when being burned, are also classified and recovered, and if necessary, investment is provided by government. When the waste is classified and concentrated intensively, the waste is treated quite easily. The stability of high intensity cement product is strong and the period of validity is long so pollution is treated when an amount of high pollution pollutant and waste water are added into the high intensity cement product and stone material during mixing, without impacting the health of human and the quality of cement product. Many substances are changed chemically and physically or are reacted with each other at high temperature; power plants and cement product producing method can be combined together to treat pollution when necessary. In this method, high pollution pollutant that is difficult to be treated is changed into substances without pollution or with little pollution through the heat of the power plants and made into high intensity cement product when necessary.