This question is too difficult. As far as I know, I will answer from several aspects from a professional point of view. Plastics are both toxic and non-toxic. This issue has been debated in academia and industry. Just look at the process, formula, synthesis technology and application. Not every plastic is poisonous. Like PP, it is often used to make cups, and the sealing ring made of stainless steel is also made of plastic or rubber. You can usually see these signs on plastic products. Let me talk about it first. The icon 1 is: PET polyethylene terephthalate, which is commonly found in mineral water bottles and carbonated beverage bottles. Heat resistance to 70 degrees is easy to deform, and substances harmful to human body are melted out. Plastic product 1 may release carcinogen DEHP after using 10 months. It can't be put in the car to bask in the sun, nor can it be used to hold substances such as wine and oil. Figure 2 shows: HDPE high-density polyethylene, which is commonly used in white medicine bottles, cleaning products, bath products, etc. But it can't be used as a cup, and it can't be used as a storage container to hold other items. The cleaning is not thorough and cannot be recycled. Icon 3 is: PVC and polyvinyl chloride, which are commonly found in raincoats, building materials, plastic films, plastic boxes and so on. This kind of plastic has excellent plasticity and low price, so it is widely used. It can only resist heat of 8 1 degree, and it is easy to produce bad substances at high temperature, so it is rarely used in food packaging. It is difficult to clean and easy to remain, so it cannot be recycled. Don't buy packaged drinks. Figure 4 shows PE polyethylene, which is commonly found in plastic wrap and plastic film. Harmful substances will be produced at high temperature, and toxic substances may cause diseases such as breast cancer and neonatal congenital defects after entering the human body with food. Never put plastic wrap in the microwave oven. Icon 5 is: PP polypropylene, which is commonly found in soybean milk bottles, yogurt bottles, juice bottles and microwave lunch boxes. The melting point is as high as 167 degrees. It is the only plastic box that can be put into the microwave oven and reused after careful cleaning. It should be noted that some microwave oven boxes are made of No.5 PP, but the cover is made of 1 PE. Because PE is not resistant to high temperature, it can't be put in the microwave oven with the box. Icon 6 is: polystyrene, which is often used for instant noodle boxes and fast food boxes in bowls. But it can't be placed in the microwave oven, so as not to release chemicals when the temperature is too high. After being filled with acid (such as orange juice) and alkaline substances, carcinogens will decompose. Avoid packing hot food in fast food boxes. Don't cook bowls of instant noodles in the microwave oven. Icon 7 is: PC and other plastics, which are commonly found in kettles, space cups and milk bottles. Department stores often use cups made of this material as gifts. It is easy to release bisphenol A, a toxic substance harmful to human body. Don't heat it when using it, and don't directly bask in the sun. We now know that some waste plastics are toxic, and some are not toxic after paying attention to details when using them. On many occasions, everyone likes to use plastic bottles to hold drinks, but drinks taste like plastic, indicating that people drink plastic instead of drinks. The most poisonous are No.3, No.6 and No.7. If you find these three-digit drinks at the bottom of the bottle, don't drink them. When it comes to plastics, we are all concerned about environmental protection. Since its appearance, plastics have been widely used, but at the same time it has also caused serious environmental problems. Plastic waste is difficult to decompose naturally, which leads to the increase of solid waste; If it flows into the ocean, it will also lead to ingestion, suffocation and poisoning of marine life, affecting marine ecology; Burning plastic waste can also cause air pollution. Some plastics, such as polyvinyl chloride (PVC) and polycarbonate, may release harmful substances or endocrine interferon under certain conditions, thus endangering the reproductive function of organisms. Therefore, reducing the use of plastics has become an important task of environmental protection. Unfortunately, the recycling of plastics is not easy, and the implementation effect is not satisfactory. Compared with metal recycling, the biggest problem of plastic recycling is that it is difficult to sort automatically by machine, and the process involves a lot of manpower. In addition to containers usually made of a single plastic, many plastic products are assembled from a variety of different materials, and the cost of disassembling them may be higher than that of recycling plastic. In addition, some plastics recycling has no economic value, such as expanded polystyrene. This kind of plastic waste is usually buried or burned. I hope this answer is helpful to you.