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Identifying the Critical Supply Chains for Black Carbon and CO 2 in the Sichuan Urban Agglomeration of Southwest China

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  • Shuangzhi Li

    (Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China)

  • Xiaoling Zhang

    (Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China
    Chengdu Plain Urban Meteorology and Environment Sichuan Provincial Field Scientific Observation and Research Station, Chengdu 610225, China)

  • Zhongci Deng

    (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China)

  • Xiaokang Liu

    (School of Economics and Management, Beihang University, Beijing 100191, China)

  • Ruoou Yang

    (Sichuan Meteorological Service Center, Chengdu 610072, China)

  • Lihao Yin

    (Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China)

Abstract

Black carbon (BC) and CO 2 emissions are the two major factors responsible for global climate change and the associated health risks. Quantifying the impact of economic activities in urban agglomerations on BC and CO 2 emissions is essential for finding a balance between climate change mitigation and pollution reduction. In this study, we utilized a city-level environmental extended multi-regional input–output model (EE-MRIO), integrated nexus strength (INS), and structural path analysis (SPA) to quantify the BC and CO 2 footprints, nexus nodes, and supply chains of 21 cities in the Sichuan urban agglomeration (SUA) from 2012 to 2017. The results revealed that approximately 70% of the BC and CO 2 footprints come from inter-city transactions, with Chengdu being the largest importing city, while the supply of other cities was greater than their consumption. The SUA has transitioned from a supply-side city cluster to a consumption-oriented city cluster in its trade with other domestic regions. The SPA analysis highlighted that the construction sector was the largest emitter of downstream BC and CO 2 , while the electricity supply, metal/nonmetallic manufacture, oil refining and coking, transportation, and extraction industry sectors were the main nexus nodes for BC and CO 2 emissions in the SUA. Notably, the reduction in BC emissions was due to decreased indirect emissions from oil refining and coking, while the decrease in CO 2 emissions was a result of reduced indirect emissions from electricity supply. This article presents, for the first time, a quantification of the heterogeneous impacts and emission supply chains of BC and CO 2 emissions from economic activities in the SUA, providing valuable insights for developing climate mitigation policies tailored to different urban clusters.

Suggested Citation

  • Shuangzhi Li & Xiaoling Zhang & Zhongci Deng & Xiaokang Liu & Ruoou Yang & Lihao Yin, 2023. "Identifying the Critical Supply Chains for Black Carbon and CO 2 in the Sichuan Urban Agglomeration of Southwest China," Sustainability, MDPI, vol. 15(21), pages 1-19, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:21:p:15465-:d:1271282
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