Why is plastic a non-biodegradable and nonpoint source of pollution?

DDT, plastics, polythene, bags, insecticides, pesticides, mercury, lead, arsenic, metal articles like aluminum cans, synthetic fibrers, glass objects, iron products and silver foils are non-biodegradable pollutants. Types of recyclable nonbiodegradable pollutants include glass, metals (like aluminum and steel), petroleum (including coal and gas) plastics

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