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Effects of the long-term rice expansion on ecosystem carbon budget in the typical agricultural area of Northeast China
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-12-01 DOI: 10.1016/j.spc.2024.11.027
Fen Zhao , Peng Yang , Qingzhu Gao , Lang Xia , Lingling Fan , Mengmeng Hu
Extensive rice expansion in northeast China has significantly altered land use and land cover (LULC) changes. However, the impact of long-term rice expansion on regional carbon budget dynamics remains unclear. A major obstacle in addressing this gap is the absence of agricultural LULC information with high spatiotemporal resolution. Here, we selected the Sanjiang Plain experienced dramatic rice expansion as the study area, presenting a framework that integrates high-resolution crop distribution data with a process-based model to quantify the impact of rice expansion on regional carbon budgets. Specifically, we employed a robust deep-learning network for crop mapping based on Landsat data, to reconstruct the spatiotemporal dynamics of rice expansion from 1985 to 2020. We then incorporated these long-term crop maps into the Denitrification-Decomposition (DNDC) model, to explore the effects of rice expansion on the regional carbon budget over this period. Analysis results showed that the rice planting area expanded by 708.64 km2/yr, resulting in more than a tenfold increase over the past 36 years. Spatially, rice planting expanded from the southwest to the northeast and from the interior to the exterior. This expansion has resulted in approximately 275 Mt. of CO2 and 6.92 Mt. of CH4 greenhouse gas emissions, altering the dynamics of the regional carbon budget and shifting the ecosystem from a carbon sink to a carbon source since 2016. Although the long-term expansion of rice increased soil respiration and CH4 emissions, it also enhanced soil carbon sequestration through agricultural management practices. These findings greatly enhance our understanding of the ecosystem carbon cycle's response to long-term agricultural LULC changes, providing more accurate data support and scientific evidence for developing low-carbon agricultural policies.
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引用次数: 0
Transforming the food system with a biomass value hierarchy: Sustainability and policy insights
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-12-01 DOI: 10.1016/j.spc.2024.11.026
Kari-Anne Lyng , Hanne Møller , Klaus Mittenzwei , Ivar Pettersen , Jakob Vesterlund Olsen , Hanne Fjerdingby Olsen
The food system significantly impacts the environment and society. This study examined a shift from a continuation of the current trend (policy as usual scenario) towards a biomass value hierarchy scenario, which focused on optimizing land and biomass use and rethinking the role of livestock production. The biomass value hierarchy was based on circular economy principles, the waste hierarchy, and national self-sufficiency, which eliminated feed import and redistributed protein sources in the diet.
A Multi-Criteria Decisions Analysis (MCDA) framework was used to assess the two scenarios across four sustainability dimensions: environmental, social, economic and policy. Environmental and social impacts were analysed using life cycle assessment methodology, while economic and policy implications were explored using partial equilibrium modelling, with the Norwegian food system as a case study.
The results for the environmental dimension indicated that, compared to the policy as usual scenario, the biomass value hierarchy reduced environmental impacts by 8 % to 18 % across the indicators, including climate change, acidification, particulate matter, terrestrial eutrophication and occupation of arable land. Social impacts also improved in categories with the highest social risks, such as equal opportunities for workers, health and safety for farmers, cultural heritage, food security, fair competition, and promoting social responsibility. Contrarily, indicators within the economic dimension revealed reduced profitability, and results within the policy dimension showed a considerable increase in required subsidies, border measures and governmental restrictions on consumption. The study findings indicate that an environmentally and socially sustainable food system is feasible but requires significant political and economic support. Additionally, the study highlights the value of using MCDA when combining different research methods in cross-disciplinary assessments. These results underscore the need for a societal debate on acceptable levels of political intervention and the role of consumers and taxpayers in shaping the future food system.
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引用次数: 0
A life cycle assessment model to evaluate the environmental sustainability of lignin-based polyols
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-12-01 DOI: 10.1016/j.spc.2024.11.019
Léo Staccioli , Andreia Maria Rodrigues dos Santos , José Gallego , Ana Kalliola , Olesya Fearon , Pablo Ortiz , Walter Pitacco , Ana Carvalho
Lignin-based polyols are expected to provide significant environmental benefits by offering new synthetic routes to various types of bio-resins for coating applications. Currently, no models evaluating lignin-based polyols are available in the literature, therefore, the present study introduces a new model to assess environmental impacts associated with the synthesis of lignin-based polyols and to evaluate their potential environmental advantages in bio-product manufacturing. The model follows the life cycle assessment methodology and is based on lignin-based polyols production at a pilot scale, beginning with kraft lignin extraction, followed by solvent fractionation. The results indicate that, compared to their petrochemical counterparts, lignin-based polyols demonstrate superior environmental performance under specific conditions, such as the use of bio-based solvents and an appropriate energy mix. Tetrahydrofuran and electricity consumption emerge as the primary hotspots contributing to environmental impact categories such as climate change, fossil resource use, and water use—identified as the main contributors to the overall environmental impact of lignin-based polyol production. An uncertainty analysis was conducted using Monte Carlo simulation. Based on the findings, producers can consider lignin-based polyols as a promising raw material if they replace tetrahydrofuran with its bio-based counterpart and adopt a renewable energy mix for production. This model can be easily extended by researchers and/or practitioners to further evaluate the environmental impacts of bio-products derived from lignin-based polyols. Moreover, the results of this study can guide policymakers in shaping bio-product policies, as lignin-based polyols show promise as a more sustainable chemical alternative.
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引用次数: 0
A systematic literature review of impactful food waste interventions at the consumer level 关于在消费者层面采取有影响力的食物浪费干预措施的系统性文献综述
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-11-22 DOI: 10.1016/j.spc.2024.11.023
Carole Liechti, Gabriele Mack, Jeanine Ammann
As consumers contribute largely to the global food waste quantity, many efforts have been made to reduce food waste through interventions. However, knowledge of the impact of the interventions is required to reduce consumers' food waste. We systematically reviewed 49 studies that evaluated 54 interventions to reduce food waste at the consumer level. The studies were assessed according to three criteria: the type of intervention (single- or multi-component), the study design (randomised experiments, non-randomised [quasi] experiments, non-experimental studies), and the impact on food waste reduction (significant reduction, non-significant reduction, no reduction). The majority of interventions were single-component (n = 45), with only a small percentage being multi-component (n = 9). Most interventions resulted in a significant reduction in food waste (n = 36). Furthermore, the majority of the studies used non-randomised (quasi) experiments (n = 35). Multi-component interventions with nudges showed promise for reducing food waste among consumers, with most having a significant impact and leading to the highest food waste reductions (up to 84.3 %). This review synthesises the current state of knowledge regarding the impact of food waste reduction interventions, which can help identify and implement effective interventions in the future.
由于消费者在很大程度上造成了全球的食物浪费量,人们已经做出了许多努力,通过干预措施来减少食物浪费。然而,要减少消费者的食物浪费,还需要了解干预措施的影响。我们系统回顾了 49 项研究,这些研究评估了 54 项在消费者层面减少食物浪费的干预措施。我们根据三个标准对这些研究进行了评估:干预措施的类型(单成分或多成分)、研究设计(随机实验、非随机[准]实验、非实验研究)以及对减少食物浪费的影响(显著减少、非显著减少、无减少)。大多数干预措施都是单一成分的(n = 45),只有一小部分是多成分的(n = 9)。大多数干预措施都能显著减少食物浪费(36 项)。此外,大多数研究都采用了非随机(准)实验(n = 35)。包含劝导的多成分干预措施显示出减少消费者食物浪费的前景,大多数干预措施效果显著,食物浪费减少率最高(达 84.3%)。本综述总结了当前有关减少食物浪费干预措施影响的知识,有助于今后确定和实施有效的干预措施。
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引用次数: 0
Sustainability-driven regime shifts in Complex Adaptive Systems: The case of animal production and food system 复杂适应系统中可持续性驱动的制度转变:动物生产和食品系统案例
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-11-21 DOI: 10.1016/j.spc.2024.11.022
Tuomas Kuhmonen , Irene Kuhmonen , Arto Huuskonen
The role of animal production in sustainability transitions has become the subject of a heated societal debate, and a variety of discourses delineating the role that animal production should take in the future prevail. Such discourses can act as attractors that configure the organisation of Complex Adaptive Systems, such as food systems. The evolution of food systems seems to follow a cyclical pattern with occasional regime shifts, which can be driven by the system swapping attractors. In this study, alternative regimes and regime shift dynamics were illustrated for the Finnish food system facing pressures for sustainability transition. Two questions were asked. First, what could be the attractors capable for facilitating a regime shift and from where could they emerge? Second, how the regime shift could happen and what would be the role of animal production in the alternative regimes? Discourse analysis and systems science methodology were used in a participatory foresight process. Five prominent new basins of attraction were identified: ethics, environment, health, national food security and global market. All these manifested a specific conceptualisation of sustainability and resulted in radically different roles for animal production in the food system. Each of the new regimes was accompanied by some new landscape level pressures for change, emphasising the importance of holistic system analysis to avoid unintended or unexpected outcomes of sustainability transitions. Insights for the difficulty of planned regime shifts, use of Multi-Level Perspective (MLP) as an empirical mapping tool, and the utilisation of societal discourses as a source for new attractors were novel elements in the approach of this study.
畜牧业在可持续发展转型中的作用已成为社会激烈讨论的主题,各种关于畜牧业在未来应发挥的作用的论述盛行。这些论述可以作为吸引物,配置复杂适应系统(如食品系统)的组织结构。粮食系统的演变似乎遵循一种周期性模式,偶尔会发生制度转变,这可能是由系统交换吸引子驱动的。在这项研究中,芬兰粮食系统面临着可持续发展转型的压力,研究人员展示了该系统的替代机制和机制转换动态。我们提出了两个问题。首先,能够促进制度转换的吸引子是什么?第二,制度转变如何发生,动物生产在替代制度中的作用是什么?在参与式展望过程中使用了话语分析和系统科学方法。确定了五个突出的新吸引点:道德、环境、健康、国家粮食安全和全球市场。所有这些都体现了可持续发展的特定概念,并导致动物生产在食品体系中扮演完全不同的角色。每一种新制度都伴随着一些新的景观层面的变革压力,这强调了整体系统分析的重要性,以避免可持续性转型产生意外或意想不到的结果。本研究方法中的新元素包括:洞察计划制度转变的难度、使用多层次视角(MLP)作为实证制图工具,以及利用社会话语作为新吸引力的来源。
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引用次数: 0
Evaluating the environmental and financial performance of additive manufacturing at scale in the consumer goods industry 评估消费品行业规模化增材制造的环境和财务绩效
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-11-20 DOI: 10.1016/j.spc.2024.11.013
Noemie Midrez , Afreen Siddiqi , Gregoire Mercusot , Bruce Cameron
As corporate sustainability commitments and environmental regulations intensify, additive manufacturing users must balance the technology's maturing economic value with its application- and process-dependent environmental impact. With limited methods to navigate this multi-dimensional variability at scale, additive manufacturing stakeholders face challenges when making growth and investment decisions. To bridge this gap, this study applies system modeling methodologies to a case study of an additive manufacturing service unit in the sporting goods industry aiming to improve its product portfolio's economic and environmental impacts and scale its capabilities. A tradespace model compares the value of additive manufacturing to injection molding across product characteristics and lifecycle decisions, and a flexible design analysis evaluates additive manufacturing scaling strategies, considering market and technology uncertainties. The tradespace analysis reveals that additive manufacturing reduces product environmental footprint by 95 % and unit cost by 93 % for 1-to-20-part production volumes compared to injection molding, while injection molding lowers environmental footprint by 72 % and unit cost by 56 % for 100-to-50,000-part production volumes compared to additive manufacturing. This analysis also suggests that additive manufacturing's economic and environmental value increases when located in geographies with low-carbon footprint energy and when manufacturing very low production quantities or small parts that maximize build capacity. The flexible design analysis indicates that expanding internal production capacity to a larger facility with renewable power, once higher demand is confirmed, can reduce part environmental footprint by up to 49 % and increase Net Present Value by more than 600 % compared to maintaining current operations that leverage external service bureaus. The results demonstrate the potential of these system modeling methodologies in integrating financial and environmental impact assessments at the company level for strategic scaling decisions. Future model developments are recommended to incorporate additive manufacturing's unique design impacts on the product lifecycle, more nuance in the impact analyses, and the social component of the technology's sustainability.
随着企业可持续发展承诺和环境法规的加强,增材制造用户必须在该技术日渐成熟的经济价值与其应用和工艺相关的环境影响之间取得平衡。由于在规模上驾驭这种多维变化的方法有限,增材制造利益相关者在做出增长和投资决策时面临挑战。为了弥补这一差距,本研究将系统建模方法应用于体育用品行业快速成型制造服务单位的案例研究,该单位旨在改善其产品组合对经济和环境的影响,并扩展其能力。贸易空间模型比较了增材制造与注塑成型在产品特性和生命周期决策方面的价值,灵活的设计分析评估了增材制造扩展战略,同时考虑了市场和技术的不确定性。贸易空间分析表明,与注塑成型相比,增材制造可将 1 至 20 件产品的环境足迹降低 95%,单位成本降低 93%;与增材制造相比,注塑成型可将 100 至 50,000 件产品的环境足迹降低 72%,单位成本降低 56%。这项分析还表明,在低碳能源地区,以及在生产量极低或能最大限度提高制造能力的小零件时,快速成型制造的经济和环境价值都会增加。灵活的设计分析表明,一旦确认有更高的需求,将内部生产能力扩展到拥有可再生能源的更大设施,与维持目前利用外部服务局的运营相比,可减少高达 49% 的零件环境足迹,并将净现值提高 600% 以上。结果表明,这些系统建模方法具有在公司层面整合财务和环境影响评估的潜力,可用于战略扩展决策。建议在未来的模型开发中纳入增材制造对产品生命周期的独特设计影响、影响分析中更多的细微差别以及该技术可持续发展的社会因素。
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引用次数: 0
Translating pro-environmental intention to behavior: The role of moral licensing effect 将环保意愿转化为行为:道德许可效应的作用
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-11-19 DOI: 10.1016/j.spc.2024.11.018
Eugene Song , Myoung-Soung Lee , Jiyun Park , Hyemi Lee
Despite an individual's altruistic intentions, these are not always put into practice. The gap between the intentions and behaviors hinders pro-environmental consumption behavior, which has been a highly important subject in the field. Considering that pro-environmental consumption is an altruistic behavior that adjusts and resolves the disparity between personal interests and social values, the role of moral licensing effect should get more attention in translating intention into behavior. However, existing studies failed to thoroughly examine the role of moral licensing effect. To address the gap in the literature, this study specifically attempted to investigate how the moral license effect influences when individual good intentions are linked to behavior. For this purpose, this study developed a novel behavioral model based on the Health Belief Model (HBM) and the Theory of Planned Behavior (TPB), while also examining the significance of the pathway through which pro-environmental behavioral intention influences actual behavior. This study conducted an online self-reported survey online and analyzed the data from 1000 participants. As a result, the level of moral licensing significantly moderated the association between pro-environmental behavioral intention and actual behavior. Participants with higher levels of moral licensing, indicating a greater tendency to rationalize unethical actions, showed a weaker translation of intention into action. It recommends developing differentiated communication strategies based on consumers' moral licensing levels, focusing on facilitating intention-to-action translation for high moral licensing individuals and reinforcing antecedents like perceived benefits for those with low moral licensing tendencies.
尽管个人有利他的意愿,但并不总是能付诸实践。意图与行为之间的差距阻碍了亲环境消费行为,而这一直是该领域非常重要的课题。考虑到亲环境消费是一种调整和解决个人利益与社会价值之间差异的利他行为,道德许可效应在将意向转化为行为方面的作用应得到更多关注。然而,现有研究未能深入探讨道德许可效应的作用。为了弥补这一文献空白,本研究特别尝试探究道德许可效应如何影响个人良好意愿与行为之间的联系。为此,本研究在健康信念模型(HBM)和计划行为理论(TPB)的基础上建立了一个新的行为模型,同时还考察了亲环境行为意向影响实际行为的途径的重要性。本研究在网上进行了自我报告调查,并对 1000 名参与者的数据进行了分析。结果发现,道德许可水平在很大程度上调节了亲环境行为意向与实际行为之间的关联。道德许可水平较高的参与者更倾向于将不道德的行为合理化,他们将意向转化为行动的能力较弱。该研究建议根据消费者的道德许可水平制定不同的沟通策略,对于道德许可水平高的人,重点是促进意向向行动的转化,而对于道德许可水平低的人,重点是强化前因,如感知到的利益。
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引用次数: 0
Improving the affordability and reducing greenhouse gas emissions of the EAT-Lancet diet in China 提高 EAT-Lancet 膳食在中国的可负担性并减少温室气体排放
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-11-19 DOI: 10.1016/j.spc.2024.11.014
Meng Li , Yanan Wang , Shunan Zhao , Wei Chen , Yu Liu , Heran Zheng , Zhongxiao Sun , Pan He , Rui Li , Sun Zhang , Peixue Xing , Qiao Li
Transforming from existing dietary patterns to sustainable dietary patterns can promote sustainable development of the environment and human health. However, a successful transformation of dietary structure is hinges on the affordability of dietary guidelines. This study compares the actual dietary consumption structure of urban and rural residents in China with the recommended values outlined in dietary guidelines, and then measures the affordability of adhering to these guidelines for both urban and rural populations. This paper forecasts the future levels of dietary affordability and potential reduction in greenhouse gas (GHG) emissions in both urban and rural regions of China. The results indicate that there is a notable disparity between actual food consumption in urban and rural regions and that recommended by the dietary guidelines. The EAT-Lancet diet successfully achieves the objectives of being affordable, nutritionally sufficient, and environmentally sustainable, and can narrow the urban-rural affordability gap. By implementing a 13 % increase in incomes, the EAT-Lancet diet can effectively achieve universal affordability at the highest price and potentially reduce greenhouse gas emissions by 30.24 %.
从现有膳食模式向可持续膳食模式转变,可以促进环境和人类健康的可持续发展。然而,膳食结构的成功转型取决于膳食指南的可负担性。本研究将中国城市和农村居民的实际膳食消费结构与膳食指南中的推荐值进行比较,然后测算城市和农村居民遵守膳食指南的可负担性。本文预测了中国城市和农村地区未来的膳食负担水平和温室气体(GHG)减排潜力。结果表明,城市和农村地区的实际膳食消费量与膳食指南推荐的消费量之间存在明显差距。EAT-Lancet膳食成功地实现了经济实惠、营养充足和环境可持续的目标,并能缩小城乡之间的负担差距。通过增加 13% 的收入,EAT-Lancet 膳食能有效实现最高价格下的全民可负担性,并可能减少 30.24% 的温室气体排放。
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引用次数: 0
Food waste and the effects of waste reduction in China's catering industry 中国餐饮业的食物浪费和减少浪费的效果
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-11-19 DOI: 10.1016/j.spc.2024.11.017
Yi Luo , Xue Qu , Fangfang Cao , Laping Wu
Reducing food waste is crucial for combating hunger. With economic development and rising income levels, more Chinese people are dining out, which may lead to an increase in the amount of food wasted in the catering industry. However, efforts to reduce food waste are hindered by a lack of accurate data. On the basis of nationwide survey data from 1957 restaurants across China, we critically assessed food waste and its impacts on resources, the environment and ecology in China's catering industry. Moreover, we conducted scenario analysis to evaluate the effects of waste reduction with reference to the survey and the UN 2030 Sustainable Development Goals. We also used an econometric model to analyze macrofactors affecting food waste in China's catering industry. The results show that, food waste in China's catering industry averages 74.16 g per capita per meal, and that restaurants in the Northeast China, large-scale restaurants, and dinner restaurants are more likely to produce large amounts of food waste. The total amount of food waste in China's catering industry has reached 23.73 million tons of food, which is equal to 47.33 million tons (CO2e) of carbon footprint, 40.3 billion m3 of water footprint, and 31.56 million hectares of ecological footprint. If the Sustainable Development Goal of halving food waste by 2030 is achieved, reducing food waste in China's catering industry could save 11.87 million tons of food, and reduce the carbon, water, and ecological footprints by 23.66 million tons (CO2e), 20.15 billion m3, and 15.78 million hectares, respectively. Econometric analysis revealed that the provincial macrofactors affecting food waste in China's catering industry are the gross domestic product (GDP), the average annual GDP growth rate, grain production, and the ratio of grain consumption to total food consumption. Strategies should be developed by the government and stakeholders to increase the community's awareness of food savings and conservation.
减少食物浪费是消除饥饿的关键。随着经济的发展和收入水平的提高,越来越多的中国人开始外出就餐,这可能会导致餐饮业的食物浪费量增加。然而,由于缺乏准确的数据,减少食物浪费的努力受到阻碍。基于对全国 1957 家餐厅的调查数据,我们对中国餐饮业的食物浪费及其对资源、环境和生态的影响进行了严格评估。此外,我们还进行了情景分析,参照调查数据和联合国 2030 年可持续发展目标,评估了减少浪费的效果。我们还使用计量经济模型分析了影响中国餐饮业食物浪费的宏观因素。结果显示,中国餐饮业的食物浪费平均为人均每餐 74.16 克,东北地区餐馆、大型餐馆和晚餐餐馆更容易产生大量食物浪费。中国餐饮业餐厨垃圾总量已达 2373 万吨,相当于 4733 万吨(CO2e)的碳足迹、403 亿立方米的水足迹和 3156 万公顷的生态足迹。如果实现到 2030 年将食物浪费减半的可持续发展目标,中国餐饮业减少食物浪费可节约 1187 万吨食物,减少的碳足迹、水足迹和生态足迹分别为 2366 万吨(CO2e)、201.5 亿立方米和 1578 万公顷。计量经济学分析表明,影响中国餐饮业食物浪费的省内宏观因素是国内生产总值(GDP)、GDP 年均增长率、粮食产量和粮食消费占食品消费总量的比例。政府和利益相关方应制定相关策略,提高全社会的节粮意识和节约意识。
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引用次数: 0
The role of global waste management and circular economy towards carbon neutrality 全球废物管理和循环经济对实现碳中和的作用
IF 10.9 1区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-11-17 DOI: 10.1016/j.spc.2024.11.021
Phyo Zaw Oo , Trakarn Prapaspongsa , Vladimir Strezov , Nazmul Huda , Kazuyuki Oshita , Masaki Takaoka , Jun Ren , Anthony Halog , Shabbir H. Gheewala
Solid waste management is a cross-cutting issue that significantly influences multiple aspects of sustainable development globally. The waste sector is a major anthropogenic source of global greenhouse gas (GHG) emissions. Most global GHG assessments of waste management rely on generic data due to limitations in available data. This research used reflective inventory data for municipal solid waste (MSW) treatment systems related to the income levels of countries, resulting in more context-specific and comprehensive assessments of GHG emissions. This study aims to assess life cycle GHG emissions from the global MSW management sector for the years 2023, 2030, and 2050 and then analyses the global and regional waste management goals set by the United Nations Environment Programme (UNEP) and the European Union (EU) to identify hotspots in the MSW management systems and critical factors that influence GHG emissions from the waste sector. The study was conducted in accordance with the standards outlined in ISO 14067:2018. The results show that the average global GHG emissions from 1 tonne of MSW in 2023 based on the existing MSW management practices was approximately 89.7 kg CO2e. The major contributor was the open dumping of MSW, contributing almost 70 % of GHG emissions. The global MSW management sector emitted a total of 173.2 Mt CO2e GHG emissions in 2023. If no improvements are made to existing systems, GHG emissions from the waste sector are projected to increase to 203.4 Mt CO2e by 2030, and to 289.5 Mt CO2e by 2050. Achieving waste management goals can reduce GHG emissions by approximately 1 % to more than 160 %. The implementation of the circular economy in the waste sector has the potential to achieve net zero emissions from the global MSW management sector by 2030 and 2050. This study provides achievable MSW management targets for the world and highlights key factors to achieve carbon neutrality from the waste sector. Prioritising policies such as upgrading open dumps, standardising household-level waste separation procedures, minimising food waste, establishing national recycling targets, and promoting circular economy through a zero-waste approach could substantially reduce GHG emissions from the waste sector. These findings are important for the adoption of circular economy principles in MSW management systems to effectively support the pursuit of carbon neutrality goals.
固体废物管理是一个贯穿各领域的问题,对全球可持续发展的多个方面产生重大影响。废物部门是全球温室气体(GHG)排放的主要人为来源。由于现有数据的局限性,大多数全球废物管理温室气体评估都依赖于通用数据。本研究使用了与各国收入水平相关的城市固体废物(MSW)处理系统的反映性清单数据,从而对温室气体排放进行了更具体、更全面的评估。本研究旨在评估 2023 年、2030 年和 2050 年全球城市固体废物管理部门的生命周期温室气体排放量,然后分析联合国环境规划署(UNEP)和欧盟(EU)制定的全球和地区废物管理目标,以确定城市固体废物管理系统中的热点以及影响废物部门温室气体排放的关键因素。这项研究是根据 ISO 14067:2018 中概述的标准进行的。结果表明,根据现有的都市固态垃圾管理方法,2023 年全球 1 吨都市固态垃圾的平均温室气体排放量约为 89.7 千克二氧化碳当量。造成温室气体排放的主要原因是城市固体废弃物的露天倾倒,占温室气体排放量的近 70%。2023 年,全球城市固体废物管理部门的温室气体排放总量为 1.732 亿吨 CO2e。如果不对现有系统进行改进,预计到 2030 年,废物部门的温室气体排放量将增至 2.034 亿二氧化碳当量,到 2050 年将增至 2.895 亿二氧化碳当量。实现废物管理目标可减少约 1%至 160%以上的温室气体排放。在废弃物领域实施循环经济有可能在 2030 年和 2050 年之前实现全球都市固体废弃物管理领域的净零排放。本研究为全球提供了可实现的城市固体废物管理目标,并强调了实现废物部门碳中和的关键因素。优先考虑改造露天垃圾场、规范家庭垃圾分类程序、最大限度减少厨余垃圾、制定国家回收目标以及通过零废弃物方法促进循环经济等政策,可大幅减少废弃物部门的温室气体排放。这些发现对于在城市固体废物管理系统中采用循环经济原则以有效支持碳中和目标的实现非常重要。
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Sustainable Production and Consumption
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