Everyone throws out a lot of garbage every day. In some areas with better waste management, most of the garbage will be disposed of in sanitary landfills, incineration, compost and other harmless treatment, while in more places, the garbage is often simply stacked or buried, which leads to the spread of odor and pollution of soil and underground water bodies.

The cost of garbage harmless treatment is very high, depending on the treatment method, the cost of handling a ton of garbage is about 100 yuan to several hundred yuan. People consume a lot of resources, mass production, mass consumption, and mass production of waste. The consequences will be disastrous.

According to the classification methods of domestic garbage in foreign cities, the classification is generally based on the composition and production of garbage, combined with the resource utilization and treatment methods of local garbage. If Germany is generally divided into paper, glass, metal and plastic; Australia is generally divided into compostable garbage, recyclable garbage and non-recyclable garbage. Japan is generally divided into plastic bottles, recyclable plastics, other plastics, resource waste, large garbage, combustible garbage, non-combustible garbage, hazardous garbage and so on.