If it is a multiple-choice question, I will choose 1, waste battery; 2. Leftovers; 3, plastic belt, bottle 4, scrap iron; 5. Waste batteries; 6. Foam.

Because:

1, plastics: such as plastic bags, plastic packaging, fast food lunch boxes, plastic cups and bottles, electrical packaging, cold drink skins, etc.

In nature, plastic waste is difficult to decompose. Its long-term accumulation provides breeding grounds for mice, mosquitoes and flies. It not only threatens human health, but also affects the appearance of the city. After plastic garbage enters the soil, it affects the permeability of the soil, destroys the quality of the soil and reduces the growth of plants by 30%. Plastic garbage is light in weight and large in volume, which occupies a lot of land when piled up or buried. Moreover, the air permeability and water permeability of the land buried with plastic garbage will be seriously affected, which is of no use value. Plastic waste after landfill may pollute groundwater.

Burning plastic waste will release a variety of chemical toxic gases, one of which is called dioxin, which is very harmful. It is formed when chlorine-containing plastics or compounds are burned, and it is highly toxic to animals. Even in a small amount of cases, dioxins can lead to abnormal death of birds and fish, causing great damage to the ecological environment. The hazards of dioxins to human body are emaciation, liver dysfunction, nerve damage, carcinogenesis and so on.

2. Batteries: For example, button cell and ordinary batteries containing mercury and cadmium and rechargeable batteries containing mercury. When it is abandoned in nature, mercury will slowly overflow from the battery, enter the soil or water source, and then enter the human body through crops, damaging people's kidneys. Under the action of microorganisms, inorganic mercury can be converted into methylmercury and accumulated in fish. After people eat this fish, methylmercury will enter human brain cells, seriously damage people's nervous system, and even lead to madness and death. The famous Minamata disease in Japan is caused by methylmercury.

Ordinary dry batteries and rechargeable batteries contain harmful heavy metals such as mercury and cadmium. After seeping out in nature, it pollutes the land and water flow and finally enters the human body. Cadmium can soften bones, cause bone deformation, bone pain, and cause liver and kidney damage.

3. Leftovers: For example, the catering industry, the floating population who eat lunch boxes, and the leftovers left by office workers in lunch boxes? Leftovers thrown in the trash can with disposable lunch boxes and wooden chopsticks are often unable to be collected as pig feed. Leftovers mixed with ordinary garbage provide nutritional conditions for a large number of mosquitoes and flies. The nutrition provided by leftovers also promotes the reproduction of bacteria in garbage, produces ammonia and hydrogen sulfide gas that are toxic to people and animals, and also promotes the production of biogas in garbage, resulting in garbage explosion.

4. Paint and pigment: For example, organic solvent paint waste contained in building and home decoration waste is dangerously toxic. Because of its high volatility, it is easy to be inhaled by human body, which may cause headache, allergy and even coma, or cause cancer. On the other hand, it is also a dangerous combustible. Pigment contains many heavy metals. Lead, which is common, will do harm to people's nerves, digestion, circulation and urinary system.

5. Cleaning chemicals: such as various household chemicals such as degreasing, descaling, floor cleaning, carpet cleaning, pipeline cleaning, air freshener, insecticide, chemical floor waxing agent and other petrochemical products that contain organic solvents or are difficult to degrade in nature. It is corrosive. Chlorine elements (such as bleach, floor lotion, etc.). ). Chlorine is toxic to human body, and burning will produce dioxin which is extremely toxic to the environment. Moreover, chlorine atoms can directly destroy the ozone layer. The chlorofluorocarbons contained in drugs will destroy the ozone layer. About 50% of pesticides contain carcinogens, some of which can damage animal livers.

Of course, there are recyclable ones!

1. Waste paper: newspapers, notebooks, all kinds of wrapping paper, office paper, advertising paper, large and small cartons, etc. But paper towels and toilet paper can't be recycled.

2. Plastics: all kinds of plastic bags, plastic packaging, disposable plastic lunch boxes and tableware.

3. Glass: glass bottles and broken glass pieces.

4. Metals: cans, tin cans, lead toothpaste skins, etc.

Hope to communicate more in the future!