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The impact of lightweighting and battery technologies on the sustainability of electric vehicles: A comprehensive life cycle assessment 轻量化和电池技术对电动汽车可持续性的影响:综合生命周期评估
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-29 DOI: 10.1016/j.eiar.2024.107668
Omidreza Ahmadzadeh , Renato Rodriguez , Jonah Getz , Samy Panneerselvam , Damoon Soudbakhsh
We present a comprehensive analysis of the greenhouse gas (GHG) emissions of two battery electric vehicles (BEVs) using detailed teardown data and contrast them with those of four internal combustion engine vehicles (ICEVs). We used the teardown data to calculate the production and recycling phases as well as for the vehicle dynamics modeling and estimating the utilization phase GHGs. After validating the models and establishing a baseline, we analyzed the effect of new trends on their net carbon footprint. Specifically, we considered lightweighting, battery technology, and charging technologies and showed the tradeoff between longer-range BEVs and their sustainability as a green alternative to ICEVs. The GHGs were calculated based on a life cycle assessment, including the vehicles' production, utilization, and disposal/recycling life. The GHGs of the production phase were calculated using detailed vehicle teardown data rather than general assumptions about the vehicles' material composition. Similarly, the utilization phase GHGs were estimated by first creating accurate dynamic models of the vehicles and validating them against vehicle test data. Then, we analyzed the effect of charging type and electricity source on the sustainability of these technologies. These studies showed that the average (mixed) US electricity source accounts for about 50 % of GHGs, and changing charging from household to station or supercharging can save about 8 % of GHG emissions. Next, we studied the effect of battery technology and lightweighting on EVs' net GHGs. OEMs have exploited both of these options to reduce the car's weight and improve its electrical consumption during the utilization phase (driving). Our study showed that while the higher energy density of battery technologies like NMC and NCAs is attractive for reducing the vehicle's weight and increasing its range, the use of rare materials significantly increases GHG emissions during production. Similarly, we showed that lightweighting by substituting steel with aluminum alloys (such as giga-casting) adds more production GHGs that significantly offset the savings in electrical consumption achieved during the vehicle's lifetime. Therefore, this study proposes three pivotal considerations in the design and utilization of electric vehicles: battery material selection, trade-off analysis for vehicle lightweighting, and adoption of efficient charging methods and energy sources, all of which aim to reduce their overall global carbon footprint.
我们利用详细的拆解数据对两款电池电动汽车(BEV)的温室气体(GHG)排放进行了全面分析,并与四款内燃机汽车(ICEV)的温室气体排放进行了对比。我们利用拆解数据计算了生产和回收阶段的温室气体排放量,并建立了车辆动力学模型,估算了使用阶段的温室气体排放量。在验证模型并建立基线后,我们分析了新趋势对其净碳足迹的影响。具体而言,我们考虑了轻量化、电池技术和充电技术,并展示了长程 BEV 与作为内燃机车绿色替代品的可持续性之间的权衡。温室气体的计算基于生命周期评估,包括车辆的生产、使用和处置/回收寿命。生产阶段的温室气体是通过详细的车辆拆解数据计算得出的,而不是对车辆材料成分的一般假设。同样,使用阶段的温室气体也是通过首先创建精确的车辆动态模型,并根据车辆测试数据进行验证来估算的。然后,我们分析了充电类型和电力来源对这些技术可持续性的影响。这些研究表明,美国的平均(混合)电力来源约占温室气体排放的 50%,而将充电方式从家庭充电改为电站充电或超级充电可减少约 8% 的温室气体排放。接下来,我们研究了电池技术和轻量化对电动汽车净温室气体排放的影响。原始设备制造商利用这两种方法减轻汽车重量,并改善其在使用阶段(驾驶)的电力消耗。我们的研究表明,虽然 NMC 和 NCA 等电池技术的高能量密度对减轻车重和增加续航里程很有吸引力,但稀有材料的使用却大大增加了生产过程中的温室气体排放。同样,我们的研究表明,以铝合金替代钢材(如千兆铸造)的轻量化技术会增加更多的生产温室气体排放,从而大大抵消了汽车寿命期内节省的电能消耗。因此,本研究提出了电动汽车设计和使用中的三个关键考虑因素:电池材料选择、汽车轻量化的权衡分析以及采用高效充电方法和能源,所有这些都旨在减少其在全球的总体碳足迹。
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引用次数: 0
The impact of policies on land use and land cover changes in the Beijing–Tianjin–Hebei region in China 政策对中国京津冀地区土地利用和土地覆被变化的影响
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-28 DOI: 10.1016/j.eiar.2024.107676
Liangen Zeng , Le Yang , Lixin Su , Haoyu Hu , Changchun Feng
The Beijing–Tianjin–Hebei (BTH) region has experienced unprecedented growth in population, economy and urbanisation in recent decades, in which a great deal of non-urban construction land have been transformed into urban construction. Researching the dynamics of land use and land cover (LULC) change is essential for formulating land regulation policies. This paper systematically quantifies changes in LULC in the BTH region from 1980 to 2015, and then deeply analyses the influence of both land regulation policies and spatial development strategies on these changes. The main discoveries of this research are: (1) The primary change in LULC is the conversion from agricultural land to construction land, and the secondary is from agricultural land to ecological land; The eastern and southern parts of the BTH region became the hotspots of LULC changes, while the western and northern parts became the cold spots of LULC changes; The centroids of construction land have been moving towards Beijing and Tianjin since before 1995. However, the direction of movement of the centroids has become divergent since 1995. For ecological land, the centroid moved eastwards before 2000, and then westward after 2010. (2) Land regulation policies have restricted the conversion of agricultural land to construction land, and they have made enormous contributions to the conversion of agricultural land to ecological land in most of the periods, especially from 2010 to 2015, when 3613.35 km2 of agricultural land were converted into ecological land due to a series of land regulation policies. The spatial development strategies have weaken the effect of the construction land agglomerated to the Beijing and Tianjin Municipalities, and promoted the construction land more divergence distribution in the BTH regions. The research results can significantly enhance farmland protection programs, and ecological land planning, which are crucial in the face of the growing demand for construction land.
近几十年来,京津冀(BTH)地区的人口、经济和城市化都经历了前所未有的发展,大量非城市建设用地转变为城市建设用地。研究土地利用和土地覆被的动态变化对于制定土地调控政策至关重要。本文系统地量化了北京-天津地区从 1980 年到 2015 年的土地利用和土地覆被变化,并深入分析了土地调控政策和空间发展战略对这些变化的影响。本研究的主要发现有(1)土地利用变化的主要特征是农用地向建设用地的转化,次要特征是农用地向生态用地的转化;北京-天津地区东部和南部成为土地利用变化的热点,西部和北部成为土地利用变化的冷点;建设用地中心自 1995 年前开始向北京和天津移动。然而,自 1995 年以来,中心点的移动方向出现了分化。生态用地的中心点在 2000 年前向东移动,2010 年后向西移动。(2)土地调控政策限制了农用地转为建设用地,对大部分时期农用地转为生态用地做出了巨大贡献,尤其是 2010-2015 年,在一系列土地调控政策的作用下,3613.35 平方公里农用地转为生态用地。空间发展战略削弱了建设用地向京津两市集聚的效应,促进了建设用地在京津冀地区更加分散的分布。面对日益增长的建设用地需求,这些研究成果可以极大地促进耕地保护计划和生态用地规划。
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引用次数: 0
Implementation of the EU carbon border adjustment mechanism and China's policy and legal responses 欧盟碳边界调整机制的实施与中国的政策和法律对策
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-28 DOI: 10.1016/j.eiar.2024.107683
Jiezhong Chang
As a major global manufacturer and exporter of raw materials, China may not be significantly affected by the implementation of the EU Carbon Border Adjustment Mechanism (CBAM) in the short term. However, as other developed economies follow and continuously expand the mechanism coverage of industries, it may have widespread and far-reaching implications for exports of related products from developing countries. In light of the global shift towards green and low-carbon transformation, China must effectively address the CBAM by speeding up the promotion of green and low-carbon initiatives through enhanced policies and legal frameworks. This requires addressing issues such as comprehensive supervision challenges in the carbon footprint of supply chain systems, incomplete policy mechanisms such as carbon pricing, inadequate legal systems and standards, and challenges in policy enforcement and coordination. To address these issues, this paper proposes enhancing carbon emission management systems, gradually expanding the scope of China's carbon emission trading, and promoting data transparency. Legislation and institutional arrangements for internalizing low-carbon costs should also be strengthened, to promote low-carbon development in all industries, setting specific low-carbon targets and requirements for production and operations.
作为全球主要的原材料生产国和出口国,中国在短期内可能不会受到欧盟碳边境调整机制实施的重大影响。但是,随着其他发达经济体的跟进和不断扩大该机制的行业覆盖范围,可能会对发展中国家相关产品的出口产生广泛而深远的影响。在全球向绿色低碳转型的大背景下,中国必须通过强化政策和法律框架,加快推进绿色低碳行动,从而有效应对CBAM。这就需要解决供应链系统碳足迹综合监管难题、碳定价等政策机制不完善、法律体系和标准不健全、政策执行和协调面临挑战等问题。针对这些问题,本文提出了加强碳排放管理制度建设、逐步扩大中国碳排放权交易范围、促进数据透明化等建议。同时,应加强低碳成本内部化的立法和制度安排,促进各行业的低碳发展,制定具体的低碳目标和生产经营要求。
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引用次数: 0
Embodied black carbon emission transfer within and across the Jing-Jin-Ji urban agglomeration 京津冀城市群内部和跨城市群的内蕴黑碳排放转移
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-27 DOI: 10.1016/j.eiar.2024.107678
Shan Guo , Qingyun Zhao , Ping He , Yang Wang , Xiuzhi Zhang
Black carbon (BC) is a vital air pollution particulate. Urban agglomeration has complex trade linkages internally and externally. Jing-Jin-Ji (JJJ) is the largest urban agglomeration in northern China and suffers from severe air pollution problems. Despite the importance of BC mitigation and the study area of JJJ, there is a lack of studies exploring the embodied BC emission transfers hidden behind trade within and across the JJJ urban agglomeration at the city scale, given the importance of interregional collaboration among cities for air pollution control. This paper applied the multiregional input-output (MRIO) analysis and structure path analysis (SPA) to investigate the impact of trade on the BC emissions in JJJ and identify the critical sectors and supply chains, using the latest available China's city-level MRIO table. The results show that the embodied BC emission intensity in JJJ is 143.17 g/104 yuan, which exceeds the national average (121.89 g/104 yuan). The Construction sector contributes 27.93 % of the total embodied BC emissions in JJJ. The cities of Handan, Tangshan, and Hengshui are the largest providers of emission-intensive products (3.51, 2.83, and 2.05 Gg, respectively) while Beijing is the largest receiver (5.78 Gg). From a supply chain perspective, Coal and Metal Mining are the main upstream industries, accounting for a considerable proportion of the BC emissions supply chain. To enhance the interregional collaborative governance of BC pollution control in JJJ, horizontal governance mechanisms, decentralized and polycentric urban planning, industrial clustering and technology upgrading, and effective policies for specific regions and industrial sectors are suggested.
黑碳(BC)是一种重要的空气污染颗粒物。城市群具有复杂的内外贸易联系。京津冀(JJJ)是中国北方最大的城市群,存在严重的空气污染问题。尽管京津冀地区对减少 BC 排放具有重要意义,但鉴于城市间跨区域协作对大气污染控制的重要性,目前尚缺乏在城市尺度上探讨隐藏在京津冀城市群内部和跨城市群贸易背后的体现性 BC 排放转移的研究。本文采用多区域投入产出(MRIO)分析和结构路径分析(SPA),利用最新的中国城市级 MRIO 表,研究了贸易对江浙沪地区 BC 排放的影响,并确定了关键部门和供应链。结果表明,张家口市的含BC排放强度为143.17克/104元,超过了全国平均水平(121.89克/104元)。建筑行业占冀中南地区内含 BC 排放总量的 27.93%。邯郸、唐山和衡水是最大的排放密集型产品提供地(分别为 3.51、2.83 和 2.05 千兆克),而北京则是最大的接收地(5.78 千兆克)。从供应链角度看,煤炭和金属采矿业是主要的上游产业,在 BC 排放供应链中占有相当大的比例。为加强张家口市 BC 污染控制的跨区域协同治理,建议建立横向治理机制、分散和多中心的城市规划、产业集聚和技术升级,以及针对特定区域和工业部门的有效政策。
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引用次数: 0
Assessment of life cycle environmental impacts of materials, driving pattern, and climatic conditions on battery electric and hydrogen fuel cell vehicles in a cold region 在寒冷地区评估材料、驾驶模式和气候条件对电池电动汽车和氢燃料电池汽车的生命周期环境影响
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-27 DOI: 10.1016/j.eiar.2024.107680
Dipankar Khanna, Eskinder Gemechu, Nafisa Mahbub, Jubil Joy, Amit Kumar
Battery electric vehicles (BEVs) and hydrogen fuel cell vehicles (HFCVs) can play an important role in addressing climate change by diminishing greenhouse gas (GHG) emissions in the worldwide road transportation sector. There is limited research on the implications of the use of lightweight materials, driving pattern, and climatic impact on the life cycle GHG emissions in a cold region. To address this limitation, we developed a framework to assess eighteen BEV and four HFCV scenarios for a cold region that consider aforementioned parameters through a combination of driving patterns (in rural, city, and highway driving) and climatic conditions (i.e., summer, mild winter, and severe winter) for both conventional and carbon fiber-reinforced plastic (CRFP)-based BEVs. A case study was conducted for Canada, considering its cold regions, using available data for HFCVs. We assessed city driving in summer and highway driving in severe winter conditions for conventional and CFRP-based HFCVs. The results show that the lowest GHG emissions are in cities in summer, with life cycle GHG emissions values of 68.7 g CO2 eq/km for CFRP-based BEVs. The highest life cycle GHG emissions are 364.4 g CO2 eq/km with conventional HFCVs on the highway in severe winter conditions' scenario. The operation phase emerges as the primary contributor to life cycle GHG emissions, closely trailed by the production phase. The analysis shows that the most sensitive parameters for CFRP-based BEVs in the city in summer scenario are vehicle lifetime and for conventional HFCVs in the highway in severe winter scenario, fuel cell efficiency. The analysis also shows the range of life cycle GHG emissions for a cold region, with conventional HFCVs on highways in severe winter conditions exhibiting the highest emissions (331.0 g CO2 eq/km) and CFRP-based HFCVs in the city in summer scenario the lowest (51.0 g CO2 eq/km).
电池电动汽车(BEV)和氢燃料电池汽车(HFCV)可以减少全球道路交通领域的温室气体(GHG)排放,从而在应对气候变化方面发挥重要作用。关于轻质材料的使用、驾驶模式和气候对寒冷地区生命周期温室气体排放的影响的研究十分有限。为了解决这一局限性,我们开发了一个框架来评估寒冷地区的 18 种 BEV 和 4 种 HFCV 情景,通过对传统 BEV 和基于碳纤维增强塑料(CRFP)的 BEV 的驾驶模式(农村、城市和高速公路驾驶)和气候条件(即夏季、温和冬季和严寒冬季)的组合来考虑上述参数。考虑到加拿大地处寒冷地区,我们利用现有的 HFCV 数据对加拿大进行了案例研究。我们评估了传统 HFCV 和基于碳纤维增强塑料的 HFCV 在夏季的城市驾驶和严冬条件下的高速公路驾驶。结果显示,夏季城市中的温室气体排放量最低,基于 CFRP 的 BEV 生命周期温室气体排放值为 68.7 g CO2 eq/km。在严冬条件下的高速公路上,传统 HFCV 的生命周期温室气体排放量最高,为 364.4 g CO2 eq/km。运营阶段是造成生命周期温室气体排放的主要因素,生产阶段紧随其后。分析表明,对于夏季在城市中行驶的基于 CFRP 的 BEV 来说,最敏感的参数是车辆寿命,而对于冬季在高速公路上行驶的传统 HFCV 来说,最敏感的参数是燃料电池效率。分析还显示了寒冷地区生命周期温室气体排放的范围,严冬条件下高速公路上的传统 HFCV 排放量最高(331.0 g CO2 eq/km),夏季情景下城市中基于 CFRP 的 HFCV 排放量最低(51.0 g CO2 eq/km)。
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引用次数: 0
Fiscal decentralization's impact on carbon emissions and its interactions with environmental regulations, economic development, and industrialization: Evidence from 288 cities in China 财政分权对碳排放的影响及其与环境法规、经济发展和工业化的相互作用:来自中国 288 个城市的证据
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-25 DOI: 10.1016/j.eiar.2024.107681
Zhongyao Cai , Xuhui Ding , Ziqian Zhou , Aixi Han , Siqi Yu , Xinyu Yang , Ping Jiang
Given the global focus on climate change and sustainable development, understanding the impact of China's fiscal decentralization on carbon emissions is essential for supporting green transformation and achieving carbon peaking and neutrality targets. This study examines data from 288 Chinese cities between 2003 and 2021, using fixed effects, moderation effects, and threshold effects models to assess the relationship between fiscal decentralization and carbon emissions, alongside its interaction with environmental regulation, economic development, industrialization, and city hierarchy. The results show that fiscal decentralization significantly aids carbon reduction, but stronger environmental regulations have not effectively slowed emission growth, creating a "green paradox." Relaxed regulations prioritize short-term economic gains, leading to underinvestment and fragmented regulatory efforts, which weaken emissions control. As economic development advances, fiscal decentralization's impact on carbon emissions shifts from positive to negative. Additionally, with increasing industrialization, the negative influence of fiscal decentralization on emission intensity becomes more pronounced. In non-first-tier cities, weak regulatory enforcement and limited autonomy hinder effective carbon reduction policies. To address these issues, the central government should enhance guidance and oversight of local environmental policies, ensure strict enforcement, optimize fiscal resources for environmental investment, and promote green economic transformation. A tailored approach to fiscal decentralization is needed to balance economic growth with environmental protection, achieving mutually beneficial outcomes.
鉴于全球对气候变化和可持续发展的关注,了解中国财政分权对碳排放的影响对于支持绿色转型、实现碳封顶和碳中和目标至关重要。本研究考察了 2003 年至 2021 年间中国 288 个城市的数据,采用固定效应、调节效应和门槛效应模型评估了财政分权与碳排放之间的关系,以及财政分权与环境监管、经济发展、工业化和城市等级制度之间的相互作用。结果表明,财政分权大大有助于减少碳排放,但加强环境监管并未有效减缓排放增长,这就形成了一个 "绿色悖论"。宽松的监管优先考虑短期经济收益,导致投资不足和监管工作分散,从而削弱了排放控制。随着经济的发展,财政分权对碳排放的影响由正转负。此外,随着工业化程度的提高,财政分权对排放强度的负面影响会更加明显。在非一线城市,薄弱的监管执行力和有限的自治权阻碍了有效的碳减排政策。针对这些问题,中央政府应加强对地方环境政策的指导和监督,确保严格执法,优化财政资源用于环保投资,促进绿色经济转型。需要采取有针对性的财政权力下放方式,以平衡经济增长与环境保护,实现互利共赢。
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引用次数: 0
What drives urban low-carbon transition? Findings from China 是什么推动了城市的低碳转型?中国的研究结果
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-25 DOI: 10.1016/j.eiar.2024.107679
Zhuhong Gao, Peng Zhou, Wen Wen
This paper assesses the city-level performance of low-carbon transition and the contributions of individual attributes to the percentage change of urban low-carbon transition performance. We developed a composite index to evaluate the status quo of low-carbon development and constructed an adjacent Malmquist index to measure the low-carbon transition performance. Then we grafted attribution analysis approach onto the Malmquist index to quantify attributions and applied convergence analysis to reveal characteristics of urban low-carbon transition. We applied the models to the case of 114 Chinese cities over time and found that the performance of urban low-carbon transition had progressed over time. Interestingly, we observed that the top performers were mainly non-pilot cities, even though pilot cities had performed better on average. Attribution analysis showed high heterogeneity over time for both types of cities, but in general, the intensity of technological innovation investment, the level of low-carbon policy system perfection and green space carbon sink were the main drivers. Convergence analysis showed that most cities had moved closer to the frontier of best practice over time and fewer cities were lagging behind their peers.
本文评估了城市层面的低碳转型绩效,以及个体属性对城市低碳转型绩效百分比变化的贡献。我们开发了一个综合指数来评估低碳发展现状,并构建了一个相邻的 Malmquist 指数来衡量低碳转型绩效。然后,我们将归因分析方法嫁接到 Malmquist 指数中以量化归因,并应用收敛分析揭示城市低碳转型的特征。我们将这些模型应用于中国 114 个城市,发现城市低碳转型的绩效随着时间的推移不断提高。有趣的是,我们发现,尽管试点城市的平均表现更好,但表现最好的主要是非试点城市。归因分析表明,随着时间的推移,两类城市的异质性都很高,但总体而言,技术创新投资强度、低碳政策体系完善程度和绿地碳汇是主要驱动因素。趋同分析表明,随着时间的推移,大多数城市都更接近最佳实践的前沿,落后于同行的城市数量较少。
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引用次数: 0
Comparative analysis of SDGs implementation: Testing a novel assessment framework approach 可持续发展目标实施情况的比较分析:测试新型评估框架方法
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-24 DOI: 10.1016/j.eiar.2024.107675
L. Issa , M. El-Fadel
This study presents a first attempt of a comparative analysis of the sustainable SDGs implementation status and systems' structure. For this purpose, a novel analytical framework approach was tested by coupling a SWOT analysis with a multi-attribute decision making (MADM) process involving a performance assessment based on selected quantitative and qualitative criteria and countries' self-assessment of SDGs achievement reflected in Voluntary National Reviews (VNRs). This performance assessment was conducted based on internal (administrative, legal, and procedural structures) and external factors (Voluntary National Reviews, external players, and funding levels). Countries are then positioned in a quadrant system based on their scores in these factors, revealing their strengths, weaknesses, opportunities, and threats in SDGs implementation. The framework was tested at a regional level with the Middle East and North Africa (MENA) region as a test bed involving twenty adjacent countries. The findings showed the effectiveness of the tested framework approach revealing the heterogeneity of the SDGs implementation level in the region, characterized by varying strengths and weaknesses with challenges related to several internal and external factors. Most notably, the perception that high income is the determinant of successful SDGs implementation is not necessarily accurate as demonstrated otherwise in the tested framework approach. High-income countries may achieve a position of strength and opportunity but can face setbacks due to other influencing factors such as internal governance or external geopolitical challenges. Conversely, low-income countries are not necessarily condemned to a position of weakness and threats with some high and middle-income countries also facing similar challenges. In closure, we highlight measures that can improve the development of the SDGs implementation system at the country level.
本研究首次尝试对可持续发展目标的实施状况和系统结构进行比较分析。为此,通过将 SWOT 分析与多属性决策(MADM)过程相结合,测试了一种新颖的分析框架方法,该过程涉及基于选定的定量和定性标准的绩效评估,以及国家自愿性国家审查(VNRs)中反映的各国对可持续发展目标实现情况的自我评估。绩效评估基于内部因素(行政、法律和程序结构)和外部因素(自愿性国家审查、外部参与者和资金水平)。然后,根据各国在这些因素方面的得分,将其置于象限系统中,从而揭示其在实施可持续发展目标方面的优势、劣势、机遇和威胁。以中东和北非地区(MENA)为试验平台,对该框架进行了区域性测试,涉及 20 个相邻国家。研究结果表明,经过测试的框架方法非常有效,揭示了该地区可持续发展目标实施水平的差异性,其特点是优缺点各不相同,面临的挑战与若干内部和外部因素有关。最值得注意的是,认为高收入是成功实施可持续发展目标的决定因素的看法并不一定准确,这一点在经过测试的框架方法中也得到了证明。高收入国家可能拥有实力和机遇,但也可能因内部治理或外部地缘政治挑战等其他影响因素而面临挫折。相反,低收入国家并不一定处于弱势和受威胁的地位,一些高收入和中等收入国家也面临着类似的挑战。在结束语中,我们强调了可在国家层面改善可持续发展目标实施系统发展的措施。
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引用次数: 0
The impact of urban landscape patterns on land surface temperature at the street block level: Evidence from 38 big Chinese cities 城市景观格局对街区地表温度的影响:来自中国 38 个大城市的证据
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-24 DOI: 10.1016/j.eiar.2024.107673
Anqi Zhang , Weifeng Li , Chang Xia , Huagui Guo
Existing literature has made substantial efforts to examine the relationships between land surface temperature (LST) and urban landscape patterns (ULPs). However, the inconsistent findings from studies on LST conducted in different cities lead to concerns about the significance and importance of ULPs. Moreover, insufficient attention has been paid to vertical ULPs and variations in their thermal effects over space and time. This study conducts a comparative analysis in 38 Chinese megacities across different seasons at the street block level to identify regularities and differences in ULP-LST linkages using geographical open data. The study quantifies ULPs with an amount of widely used and new two- and three-dimensional spatial metrics from three aspects—city plan patterns (CPPs), building patterns (BPs), and land use patterns (LUPs)—based on Conzen's townscape analysis framework. Results reveal that the consideration of overall or specific aspects of ULPs can enhance the explanation of spatial variations in LST, particularly during summer and spring. The improvements are highest for LUPs, followed by CPPs and BPs. Regardless of seasons and cities, building arrangement, built-up areas, greens, water bodies, elevation, slope, and road density are the most influential ULP indicators, whereas block size, sky view factor, building density, and building height present limited or unintended effects. Furthermore, our results indicate the time- and place-varying relationships between ULPs and LST, and some ULP indicators demonstrate two-sided effects on LST across different seasons or cities. We suggest that optimizing building layout and land use composition to increase green-blue spaces and urban shading zones may be more effective for alleviating the urban heat island effect than changing urban density.
现有文献在研究地表温度(LST)与城市景观格局(ULPs)之间的关系方面做出了大量努力。然而,在不同城市进行的地表温度研究结果并不一致,导致人们对城市景观格局的意义和重要性产生担忧。此外,人们对垂直 ULP 及其热效应在空间和时间上的变化关注不够。本研究对中国 38 个特大城市不同季节的街道街区进行比较分析,利用地理开放数据找出 ULP 与 LST 联系的规律性和差异性。研究以康森的城镇景观分析框架为基础,从城市规划格局(CPP)、建筑格局(BP)和土地利用格局(LUP)三个方面,使用大量广泛使用的新型二维和三维空间指标对ULP进行量化。研究结果表明,考虑城市规划模式的整体或特定方面可以加强对 LST 空间变化的解释,尤其是在夏季和春季。LUP的改善程度最高,其次是CPP和BP。无论季节和城市如何,建筑布局、建筑密集区、绿地、水体、海拔、坡度和道路密度都是最有影响力的ULP指标,而街区大小、天空视角系数、建筑密度和建筑高度的影响有限或非预期。此外,我们的研究结果表明,ULP 与 LST 之间存在时空变化关系,一些 ULP 指标在不同季节或城市对 LST 有双面影响。我们建议,优化建筑布局和土地利用构成,增加绿蓝空间和城市遮阳带,可能比改变城市密度更有效地缓解城市热岛效应。
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引用次数: 0
Carbon emissions reduction target and green utilization of land resources: Evidence from the industrial land market in China 碳减排目标与土地资源的绿色利用:来自中国工业用地市场的证据
IF 9.8 1区 社会学 Q1 ENVIRONMENTAL STUDIES Pub Date : 2024-09-21 DOI: 10.1016/j.eiar.2024.107677
Xin Lin , Eddie Chi-man Hui , Jianfu Shen

Countries around the world are proposing ambitious carbon emissions reduction targets to combat climate change, but rigorous causal evidence on how these targets affect governments' decisions and resource allocation is relatively scarce. Using a sharp regression discontinuity design, this study finds that tougher carbon targets can effectively green local governments' land resource allocation in China, as evidenced by around 15 % more land being supplied to carbon-friendly industries than under weaker targets. However, given resource reliance and the nature of comparative advantage, local governments do not reduce the proportion of land allocated to carbon-intensive industries when facing tough carbon emissions reduction targets. Further evidence indicates that greater pressure to achieve economic growth, higher career incentives, and stronger competitive pressure weaken the effect of tougher carbon targets on the green utilization of land resources, whereas stronger public attention strengthens the efficacy of carbon targets. Counties with tougher carbon targets than others experience simultaneous reductions in carbon emissions and GDP after increasing the share of carbon-friendly industrial land. This work provides policy implications for promoting the greener utilization of land resources and more sustainable development in the context of governments facing trade-offs between the economy and the environment under a multitasking evaluation system.

为应对气候变化,世界各国都提出了雄心勃勃的碳减排目标,但有关这些目标如何影响政府决策和资源分配的严谨因果证据却相对匮乏。本研究采用急剧回归不连续设计,发现更严格的碳减排目标可以有效地绿化中国地方政府的土地资源配置,与较弱的目标相比,向碳友好型产业提供的土地增加了约 15%。然而,考虑到资源依赖性和比较优势的本质,地方政府在面对严厉的碳减排目标时,并不会减少碳密集型产业的土地配置比例。进一步的证据表明,更大的经济增长压力、更高的职业激励和更强的竞争压力削弱了更严格的碳减排目标对土地资源绿色利用的影响,而更强的公众关注则加强了碳减排目标的效力。与其他国家相比,碳目标更严格的国家在增加碳友好型工业用地比例后,碳排放量和 GDP 会同时减少。这项工作为政府在多重任务评价体系下面临经济与环境权衡的背景下,促进土地资源的绿色利用和更可持续的发展提供了政策启示。
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引用次数: 0
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Environmental Impact Assessment Review
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