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Unveiling China’s Primary Microplastic Emissions: Supply Chain Dynamics from Multiple Perspectives
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Using an economic input-output model that traces supply chains across Chinese provinces, this study estimated primary microplastic emissions from production, consumption, and income perspectives, finding that eastern coastal provinces dominate emissions but that the responsible sector shifts depending on which accounting method is used. Transportation and textiles were the top-emitting sectors under all approaches. This kind of supply-chain analysis is essential for designing effective policy — assigning pollution responsibility to the right actors rather than just the regions where plastic is made.
It is of great significance to unveil the supply chain dynamics of the primary microplastic pollutants as well as to identify the emission responsibilities of different regions and sectors. In this study, a clustering-aided multiregional input–output microplastic emission (CMME) model is developed through integrating the multiregional input–output model and hierarchical clustering into a general framework. The CMME model can trace primary microplastic emissions under production-based accounting (PBA), consumption-based accounting (CBA), and income-based accounting (IBA). It can also reveal the emission patterns across regions and sectors, providing a practical basis for differentiating responsibilities and formulating policy implications. The results reveal that the microplastic emissions in the eastern coastal provinces of China are dominant; however, their contributions vary along with different perspectives (PBA: Guangdong > Shandong > Zhejiang; CBA: Guangdong > Zhejiang > Jiangsu; IBA: Shandong > Guangdong > Jiangsu). The results show that, under all perspectives, transportation and textile industries are the main contributors of microplastic emissions. Provinces with abundant energy resources (e.g., Inner Mongolia and Xinjiang) have a large number of energy extraction and processing industries, which form an important microplastic emission cluster under IBA. The findings are helpful in clarifying the emission responsibilities of different regions and industries, providing a scientific basis for the Chinese government to formulate policies for reducing and controlling microplastics emissions.
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