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like a string of pearls, hydrocarbons like string together the pearls, the polymer chain is to line up a string of pearls. In light degradation, the UV lines of the polymer chain composed destroyed, hydrocarbons naturally separated. But, nevertheless, this process is very slow. Treatment usually discarded plastic bags are landfilled. High-density polyethylene plastic bags after centuries buried underground will not decompose. Coastal areas in the United States, plastic bags are one of the most common 10 kinds of garbage. For this reason, it has become popular all over the world "plastic limit." San Francisco is limiting consumers to use plastic bags. From the beginning of April last year, the city only allows the use of biodegradable plastic bags or paper bags renewable. Biodegradable bags can decompose in a few months rather than a few hundred years. In China, as early as four years ago began

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