Material metabolism and associated environmental impacts in Pearl River Delta urban agglomeration

IF 4.9 3区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL Journal of Industrial Ecology Pub Date : 2024-07-29 DOI:10.1111/jiec.13531
Guochun Huang, Lulu Song, Yizhuo Wen, Wei-Qiang Chen
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Abstract

Rapid urbanization has resulted in significant bulk materials use, raising concerns over associated environmental impacts and sustainability challenges. However, a significant gap remains in the city-level analysis of bulk materials production, use, and associated environmental impacts in China. This study calculated the stocks and flows of 13 bulk materials and their associated greenhouse gas (GHG) emissions across nine cities in the Pearl River Delta urban agglomeration (PRDUA) of China during 2000–2020. Results showed that total and per-capita material stocks within the PRDUA experienced a continuous increase, with an average annual growth rate of 0.5 Gt/year and 4.4 t/cap/year, respectively. Both material stocks and flows exhibited similar spatial distribution patterns that gradually decreased from the center to the perimeter. As stocks continuously increase, GHG emissions from material production were rising annually, reaching 187.2 Mt CO2e in 2020. While recycling end-of-life materials contributes to reducing GHG emissions, the current limited mass of recycling curtails its broader impacts. This situation highlights a significant untapped potential within the city to meet decarbonization goals. To maximize the carbon reduction benefits, it is essential to enhance recycling efforts. Moreover, it is crucial that recycling strategies are specifically tailored to suit the timing, location, and types of materials involved.

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珠江三角洲城市群的物质代谢及相关环境影响
快速城市化带来了大量散装材料的使用,引发了人们对相关环境影响和可持续发展挑战的关注。然而,中国城市层面的大宗材料生产、使用及相关环境影响分析仍存在巨大差距。本研究计算了 2000-2020 年间中国珠江三角洲城市群(PRDUA)九个城市 13 种大宗材料的存量和流量及其相关温室气体(GHG)排放量。结果表明,珠三角城市群的总物质存量和人均物质存量持续增长,年均增长率分别为 0.5 千兆吨/年和 4.4 吨/人/年。物质存量和流量都呈现出类似的空间分布模式,即从中心向周边逐渐减少。随着存量的不断增加,材料生产产生的温室气体排放量也在逐年上升,到 2020 年将达到 1.872 亿吨 CO2e。虽然回收利用报废材料有助于减少温室气体排放,但目前有限的回收利用量限制了其更广泛的影响。这种情况凸显了城市在实现脱碳目标方面尚未开发的巨大潜力。为了最大限度地实现减碳效益,必须加强回收利用工作。此外,根据时间、地点和所涉及材料的类型专门制定回收战略也至关重要。
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来源期刊
Journal of Industrial Ecology
Journal of Industrial Ecology 环境科学-环境科学
CiteScore
11.60
自引率
8.50%
发文量
117
审稿时长
12-24 weeks
期刊介绍: The Journal of Industrial Ecology addresses a series of related topics: material and energy flows studies (''industrial metabolism'') technological change dematerialization and decarbonization life cycle planning, design and assessment design for the environment extended producer responsibility (''product stewardship'') eco-industrial parks (''industrial symbiosis'') product-oriented environmental policy eco-efficiency Journal of Industrial Ecology is open to and encourages submissions that are interdisciplinary in approach. In addition to more formal academic papers, the journal seeks to provide a forum for continuing exchange of information and opinions through contributions from scholars, environmental managers, policymakers, advocates and others involved in environmental science, management and policy.
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