A Systematic Literature Review of Green and Sustainable Logistics: Bibliometric Analysis, Research Trend and Knowledge Taxonomy - MDPI
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International Journal of Environmental Research and Public Health Review A Systematic Literature Review of Green and Sustainable Logistics: Bibliometric Analysis, Research Trend and Knowledge Taxonomy Rui Ren 1 , Wanjie Hu 2, * , Jianjun Dong 2, *, Bo Sun 2 , Yicun Chen 3 and Zhilong Chen 1 1 College of Defense Engineering, Army Engineering University of PLA, Nanjing 210042, China; renrui0801@163.com (R.R.); Chen-zl@vip.163.com (Z.C.) 2 College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China; sunbo8079@163.com 3 Research Institute for National Defense Engineering of Academy of Military Science PLA China, Beijing 100850, China; cyc-lgdx@foxmail.com * Correspondence: steve_hu@vip.163.com (W.H.); dongjj@njtech.edu.cn (J.D.) Received: 25 November 2019; Accepted: 25 December 2019; Published: 30 December 2019 Abstract: Ever-growing globalization and industrialization put forward impending requirements for green and sustainable logistics (G&SL). Over the past decades, G&SL initiatives triggered worldwide deliberations, aiming at easing negative transport externalities and improving supply chain performance. This review-based paper attempts to offer a joint quantitative and qualitative understanding for the overall evolutionary trend, knowledge structure, and literature gaps of the G&SL research field. Employing the science mapping approach, a total of 306 major paper published from 1999 to 2019 were retrieved, elaborated on, and synthesized. Visualized statistics regarding publication years, journal allocation/co-citation, inter-country/institution collaboration, influential articles, co-occurred keywords, and time view clusters of research themes were analyzed bibliographically. On this basis, a total of 50 sub-branches of G&SL knowledge were classified and thematically discussed based on five alignments, namely (i) social-environmental-economic research, (ii) planning, policy and management, (iii) application and practice, (iv) technology, and (v) operations research. Finally, the current knowledge obstacles and the future research opportunities were suggested. The findings contribute to portray a systematic intellectual prospect for the state quo, hotspots, and academic frontiers of G&SL research. Moreover, it provides researchers and practitioners with heuristic thoughts to govern transportation ecology and logistics service quality. Keywords: sustainable logistics; freight transportation; green initiative; transport and environment; supply chain management; literature review; bibliometric; taxonomy 1. Introduction Sustainable development has inspired many green and sustainable logistics (G&SL) activities to reduce the negative effects of freight transportation [1] and improve positive environmental and social feedbacks. From long-haul heavy-duty logistics to intra-city distribution, road-based freight transportation systems generate tremendous negative externalities in daily operations [2], including pollutant emissions, congestion, traffic accidents, noise, visual interference, infrastructure failure and resource waste [3]. Moreover, these negative externalities, together with the disadvantages of logistics system itself (e.g., limited intelligentization, personnel dependence and vulnerability [4]), further lead to the downgrade of supply chain performance at both enterprise level and regional level. With the rapid growth of logistics demand, the damage grows exponentially, which will eventually bring irreversible impacts to the economy and the whole ecosystem [5]. Int. J. Environ. Res. Public Health 2020, 17, 261; doi:10.3390/ijerph17010261 www.mdpi.com/journal/ijerph
Int. J. Environ. Res. Public Health 2020, 17, 261 2 of 25 The operation management of physical distribution is one of the most significant and challenging sub-issues of the macro supply chain management (SCM) [6], because it involves real-time scheduling and coordination of hundreds of thousands of packages and containerized goods under a dynamic logistics scenario [7]. G&SL is defined as the planning, control, management, and implementation of logistics system through the advanced logistics technologies and environmental management, aiming to reduce pollutant emissions and improve logistics efficiency [8]. G&SL is not only concerned with providing customers with green products or services [9], but also with the green and sustainability of the entire lifecycle of the logistics process [10]. Various green logistics modes, activities, and behaviors were proposed and gradually realized from government rules to technological innovations. For example, the construction of green logistics network [11–13], reverse logistics [14], emission control [15], electric freight vehicle [16], modal shift and multimodal transportation [17], energy efficiency [18], collaboration [19,20], outsourcing [21,22], etc. A wide range of topics related to G&SL yielded substantial academic results and considerable practical performance. However, G&SL is still in its infancy and is far from meeting the challenges posed by the complexity of internal cooperation and uncertainties of external markets [1]. Previous studies reviewed G&SL from different perspectives. By reviewing 115 papers, Zhang et al. [10] analyzed the combinatorial optimization problems and swarm intelligence technique applied in improving G&SL performance. Qaiser et al. [23] conducted some brief statistics on the bibliometric information of 40 papers on G&SL. Bask and Rajahonka [8] mainly reviewed the role of environmental sustainability in multimodal freight transport decision-making. Based on 56 papers, Mangiaracina et al. [24] summarized the impact of business-to-customer transportation process on the environment. Arvidsson et al. [25] reviewed the sustainable measures for improving urban distribution efficiency. Pourhejazy and Kwon [26] conducted a survey on 380 articles published from 2005–2016 and revealed the application status of operations research technique in the supply chain optimization. The literature of green SCM was classified and reviewed by Srivastava [4] from a reverse logistics angle. This work was further enriched by Fahimnia et al. [27], who investigated the bibliographical information and trend of a majority of green SCM research through article co-citation network and keywords co-occurrence network. However, based on the time of publication and the number of papers contained, the existing studies are outdated and incomplete, unable to provide a comprehensive analysis of the booming G&SL research in the past two years. Also, it is more difficult to integrate the multitudinous research directions to build a complete knowledge structure for G&SL. Therefore, it is of great theoretical and practical significance to objectively and quantitatively investigate the overall progress of G&SL. This study aims to conduct a comprehensive review of the global G&SL literature, so as to explore the state-of-the-art, hotspots and research trend, as well as to build the G&SL knowledge classification system. Specifically, first, tracking and analyzing the evolution of the G&SL research field from (i) publication year and journals; (ii) countries, regions, and organizations; (iii) influential documents; (iv) keywords clustering and research themes. Second, establishing the knowledge taxonomy based on the scientometric results. Third, identifying the research gaps and the future research opportunities. The novelty of this study lies in two aspects. One is to integrate the science mapping approach into the systematic literature review process to visualize the relationships among the G&SL literature. Science mapping approach is composed of data mining and bibliographic analysis, which can minimize subjective arbitrariness and grasp useful information to facilitate in-depth thematic analysis. Another is that this study further extends the bibliography to illuminate the emerging knowledge branches, gaps, and agendas in G&SL research, which will contribute to the improvement of G&SL practice and research innovation. The findings are expected to provide researchers and practitioners with a panoramic description and in-depth understanding of G&SL research. Additionally, the proposed knowledge structure can also be used as a handbook-like tool to further collect, analyze, and expand knowledge in the G&SL field and to provide references for other innovative logistics initiatives.
Int. J. Environ. Res. Public Health 2020, 17, 261 3 of 25 Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW 3 of 25 The rest The rest isis organized organized as as follows. follows. In Section 2, the outline of research method is introduced. introduced. Section33presents Section presents thethe results results of data of the the data collection collection and and the the results results of five of five parts of parts of scientometric scientometric analysis. analysis. Section 4 proposes the taxonomy of G&SL research based on the keywords Section 4 proposes the taxonomy of G&SL research based on the keywords clustering and discusses clustering and discusses the the knowledge knowledge branches inbranches detail. Thein detail. currentThe currentgaps research research gaps and and agenda areagenda are also identified. also identified. Section 5 Section 5 summarizes summarizes the majorand the major findings findings and limitations. limitations. 2. 2. Research Research Method Method 2.1. 2.1. Overview Overview of of Review Review Protocol Protocol This Thisreview-based review-basedstudystudyconducted conductedaasystematic systematicinvestigation investigationon onthe theacademic academicdevelopment developmentof of global global G&SL research with the aids of science mapping. Science mapping is a quantitativeanalysis G&SL research with the aids of science mapping. Science mapping is a quantitative analysis approach approachthat thatuses mathematical uses statistics mathematical and visualization statistics techniques and visualization to study to techniques bibliographic networks study bibliographic (e.g., academics, institutions, themes, keywords, and journals) in a specific field [28]. networks (e.g., academics, institutions, themes, keywords, and journals) in a specific field [28]. ThisThis approach has been widely approach has beenapplied in many widely academic applied in many fields, such as academic sustainable fields, such astransportation [29], environment sustainable transportation [29], science [30], city logistics [31] and waste management [32] and can directly synthesize environment science [30], city logistics [31] and waste management [32] and can directly synthesize salient findings from thefindings salient existingfrom knowledge system. the existing knowledge system. Figure Figure11illustrates illustratesthe thedetailed detailedresearch researchprocess, process,consisting consistingofofthree threesteps. steps. Publication Influential research Literature retrieval and Comprehensive retrieval chronicle highlight selection from WoS and Scopus Articles across journals Duplicates filtering and form inspection Descriptive analysis Visualization of collaboration among Document refine following countries and regions inclusion/exclusion criteria Visualization of VosViewer coding and collaboration among scientometric analysis global orgainzaitions Knowledge taxonomy of G&SL literature Timeview and Visualization of co- Visualization of co- clustering of co- cited journals cited documents Thematic discussion on occurred keywords the clustered themes Research trend of G&SL Findings and conclusions Current research gaps and agenda of G&SL Figure1. Figure 1. The The flowchart flowchart of of reviewing reviewingG&SL G&SLliterature. literature. In Instep step1, 1, thethe statistics was was statistics obtained after aafter obtained comprehensive retrievalretrieval a comprehensive from twofrom electronic two databases, electronic Web of Science databases, Web(WoS) core and of Science Scopus. (WoS) core Two and rounds Scopus.ofTwoselection rounds were then performed of selection were thento refine, classify, performed to and encode the documents. The year publication trend, journal allocation and the refine, classify, and encode the documents. The year publication trend, journal allocation and the most cited articles were mostdescribed. cited articles were described. Four Four scientometric scientometric tests tests were were carried carried out out in in step step 2,2,namely namely(i) (i)Journal Journalco-citation co-citationanalysis: analysis: to to identify identify the most most cited citedjournals journalsand andthe the research research domains domains they they belong belong to. analysis to. This This analysis helps helps to to reveal the distribution of published journals and cited journals of the reviewed documents, so as to identify popular journals in G&SL research domain. (ii) Countries/organizations collaboration analysis: to
Int. J. Environ. Res. Public Health 2020, 17, 261 4 of 25 reveal the distribution of published journals and cited journals of the reviewed documents, so as to identify popular journals in G&SL research domain. (ii) Countries/organizations collaboration analysis: to visualize the collaborative research network of G&SL among countries and organizations, so that the readers can quickly understand the partnerships between major research communities and institutions around the world. (iii) Document co-citation analysis: to highlight the influential G&SL articles and the corresponding reference relationships. By analysis of the papers with high citation, the emerging trend of scholars’ research interest to G&SL is easier to grasp. (iv) Keywords co-occurrence analysis: to map out the co-occurred time zone of the hotspots G&SL keywords and cluster them into several research themes. Network analysis of co-occurred keywords is used to clarify the knowledge structure of G&SL as well as to present the research hotspots and potential research opportunities in the future. In step 3, the hierarchical knowledge structure of G&SL was proposed for thematic discussion. The text mining software VOSviewer was adopted for science mapping, combining with another software CiteSpace to portray the time view of the clustered keywords based on the same data. VOSviewer, developed by van Eck and Waltman [33], is a comprehensive bibliometric analysis tool based on Visualization of Similarities (VOS) technology, which has unique advantages in clustering fragmented knowledge from different domains according to their similarity and relatedness. In the visualized networks, a node signifies a particular bibliographic item, such as organization, country, keyword or reference, etc. The node size represents the counting of the evaluated item namely citation or occurrence. Link denotes the co-citation, co-occurrence or collaboration relationship. The metric, total link strength (TLS), is outputted automatically by the software to reflect the correlation degree between any two nodes in the generated networks. A higher value of TLS, the higher importance and centrality of the item has [31]. Nodes with a high similarity were clustered together and distinguished by colors with other clusters, while the nodes with low similarity should be separated as far as possible. The similarity matrix can be calculated by Formula (1), where cij is the co-occurred or co-cited times of item i and item j, Wi and Wj denote the node sizes of item i and item j respectively [33]. The stopping criterion of VOSviewer mapping is the minimal sum of weighted Euclidean distances of all items in each cluster [34], which can be expressed by Formula (2), where xi and xj are the positions of the nodes. For a detailed operation manual of bibliographical experiments using science mapping approach, readers are advised to refer Jin et al. [28] and Hu et al. [31]. h i h i S = similarityij = cij · Wi /W j (1) X X E(X, S) = similarityij kxi − x j k2 , kxi − x j k = 1, for ∀i, j (2) i
Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW 5 of 25 Int. J. Environ. Res. Public Health 2020, 17, 261 5 of 25 business competition and (iii) offshoring and lean production. Finally, 91 records were removed, leavingon design 306 thefull-length articles specialized in our logistics review portfolio. technology e.g., biomass and biofuel; (ii) business competition and (iii) offshoring and lean production. Finally, 91 records were removed, leaving 306 full-length articles in our review portfolio. Table 1. Results of literature retrieval and selection. Initial Records: Table 1. Results of literature retrieval and selection. 418 Databases Web of Science Core Scopus InitialInitial Records: Records: 418 Databases Web of Science Core Scopus 742 Initial Records: 742 TI = TI ((“sustainable” OR “green” OR “sustainability” OR = ((“sustainable” OR “green” OR “sustainability” OR “environmental” OR “environmental” OR “ecofriendly” “ecofriendly” OR “ecological”)AND OR “ecological”) AND (“logistics” OROR (“logistics” (“reverse” (“reverse”ANDAND“logistics”) “logistics”) OROR((“freight” ((“freight” OR Valid records Logical OR “goods” “goods” OR “cargo”) OR “cargo”) ANDAND (“transport” (“transport” OR OR “transportation”Valid OR records (first-round (first-round Logical statement “transportation” OR “delivery” OR “distribution” OR filter): statement “delivery” OR “distribution” OR “movement” OR “shipment” filter): “movement” OR “shipment” OR “supply”))) OR (“electric” 397 OR “supply”))) AND (“truck”OR OR(“electric” AND“vehicle”)))) (“freight” AND (“truck” OR AND (“freight” AND 397 “vehicle”)))) Language:AND Language: (English) AND Type:(English) AND (Article) AND Type: Time (Article) span: AND (1999–2019) Time span: (1999–2019) (i) green logistics (i) green initiatives logistics initiativesand and practices; (ii)strategy, practices; (ii) strategy, policy, policy, Inclusion Inclusion criteria environmental environmental evaluation,review evaluation, reviewandand technology; technology; (iii) (iii) planning Final records criteria planning and operational research, etc. Final records (second-round filter): and operational research, etc. 306 (i) non-peer-reviewed journals;(ii) (ii)lack lack of of references, (second-round (i) non-peer-reviewed journals; references, authorships or full text; (iii) less than 5 pages; (iv) Articles do filter): Exclusion authorships or full text; (iii) less than 5 pages; (iv) Articles do not Exclusion criteria not relate to G&SL (e.g., generalized supply chain 306 criteria relate to G&SL (e.g., management, leangeneralized supplyand production, market chain management, purchasing, and lean production, market and purchasing, and public transport) public transport) 3. Scientometric 3. Scientometric Experiments Experiments and and Analysis Analysis 3.1. Chronological 3.1. Chronological Publication Publication Trend Trend Figure 22 displays Figure displays the the number number of of papers papers published published annually annually fromfrom 1999–2019 1999–2019 in in the the portfolio. portfolio. Obviously, research Obviously, research on on G&SL G&SL was was virtually virtually stagnant stagnant until until 2009, 2009, and and since since 2010, 2010, itit has has increased increased significantlyyear significantly year by by year.year. By a2018, By 2018, a staggering staggering 62 articles62were articles were The searchable. searchable. vigorousThe vigorous development development of of academic academic research indicatesresearch indicates the expansion thescope of the expansion of the and branch scope and of G&SL. branch of Furthermore, G&SL. from the Furthermore, publication from the number andpublication number and the recent discussed the recent topics discussed of G&SL, topicsthat it is evident of G&SL, it is evident the public that awareness, the public market awareness, acceptance, market social demandacceptance, social demand and real-world practiceand real-world logistics of sustainable practice of sustainable measures are logistics measures undergoing are undergoing remarkable ascent. remarkable ascent. Figure 2. Year profile of indexed documents. Figure 2. Year profile of indexed documents.
Int. J. Environ. Res. Public Health 2020, 17, 261 6 of 25 Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW 6 of 25 3.2. Journal 3.2. Journal Allocation Allocation and and Co-Citation Co-Citation Analysis Analysis All 306 All 306 documents documentswere werefoundfoundinin81 81different differentjournals. journals.As As shown shown in in Figure Figure3, 3, the the top top 15 15 journals journals contributed 155 contributed 155 papers, papers, accounting accounting for for 51% 51% of of the the total. total. The The impact impact factors factors ofof journals journals were were also also attached based on the Journal Citation Reports (2018). Sustainability ranks first attached based on the Journal Citation Reports (2018). Sustainability ranks first (35, 11.4%), followed(35, 11.4%), followed by Journal by Journal ofof Cleaner Cleaner Production Production (24, (24, 7.8%), 7.8%), Transportation Transportation Research Research Part Part D:D: Transport Transport and andEnvironment Environment (17,5.6%) (17, 5.6%) and and International InternationalJournal JournalofofProduction ProductionEconomics Economics(13, (13,4.2%). 4.2%). Among Amongthe the top top 1515 journals, journals, eight eight are from UK, four from The Netherlands, two from Switzerland, and one are from UK, four from The Netherlands, two from Switzerland, and one from Germany. The papers from Germany. The papers aremainly are mainlydistributed distributedin in the the three three academic academic fields fields ofof environment, environment, traffic traffic engineering engineering and and operations operations management, but management, but they they obviously obviously account account for for aa larger larger proportion proportion in in the the environmental environmental science science and and sustainablefield, sustainable field,which whichisisin inline linewith withthe theconnotation connotationof ofG&SL. G&SL. Figure 3. Rank Figure 3. Rank of of journals journals in in G&SL G&SL publication publication number. number. As As shown shown in in Figure Figure 4,4, among among the the 12,408 12,408references references(corresponding (correspondingtoto2349 2349different differentjournals), journals),a anetwork networkofof 46 items and 1025 links was formed by identifying the journals that had been cited cited 46 items and 1025 links was formed by identifying the journals that had been more more than 50 times. In general, the journals that influenced G&SL research than 50 times. In general, the journals that influenced G&SL research are concentrated in three are concentrated in three interrelated interrelatedclusters. clusters.First is the First operations is the operations research (OR),(OR), research such as European such Journal of as European Operational Journal Research of Operational (TLS = 13,076, citation = 494), International Journal of Production Research (TLS = Research (TLS = 13,076, citation = 494), International Journal of Production Research (TLS = 252, citation 252, citation = 8260),= Expert 8260), Systems with Applications Expert Systems (TLS =(TLS with Applications 4748,=citation = 153),=Omega 4748, citation (TLS =(TLS 153), Omega 5139, citation = 5139, = 150)= and citation 150) Computers & Operations Research (TLS = 4234, citation = 137), which can offer quantitative and Computers & Operations Research (TLS = 4234, citation = 137), which can offer quantitative methods methods for the decision-making and optimization issues related to G&SL. The second for the decision-making and optimization issues related to G&SL. The second cluster is transportationcluster is transportation research research (TR), (TR),such suchas asTransportation TransportationResearch ResearchPartPartAA(TLS(TLS==2057, citation== 103), 2057,citation 103), Part Part D (TLS== 3883, D (TLS 3883, citation = 176), Part E (TLS = 7576, citation = 260), and Journal of Transport Geography (TLS == 2089, citation = 176), Part E (TLS = 7576, citation = 260), and Journal of Transport Geography (TLS 2089, citation== 91), citation which accumulates 91), which accumulates enormous enormous knowledge knowledge towards towards transportation transportation planning, planning, technology technology and and operations that can enlighten G&SL research from real-life transport demandand operations that can enlighten G&SL research from real-life transport demand andpractice. practice. The The third third cluster, including Supply cluster, including Supply Chain Chain Management Management (TLS (TLS ==6546, citation==232), 6546,citation InternationalJournal 232),International Journal of of Physical Distribution & Logistics Management (TLS = 6357, citation = 235) and Physical Distribution & Logistics Management (TLS = 6357, citation = 235) and Journal of Business Logistics Journal of Business Logistics (TLS = 2837, = 2837, citation (TLS citation = 96), = 96), etc., etc., reveals reveals that aamount that a large large amount of G&SL of research G&SL research was conducted was conducted based based on the research foundation of logistics and supply chain on the research foundation of logistics and supply chain management (SCM). Among management (SCM). Among all all the the publications, of Cleaner Production (TLS = 13,799, citation = publications, Journal of Cleaner Production (TLS = 13,799, citation = 555) and International Journal of Journal 555) and International Journal of Production Economics (TLS = 13,903, citation = 495) are the two most co-cited journals. They often act
Int. J. Environ. Res. Public Health 2020, 17, 261 7 of 25 Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW 7 of 25 Production Economics (TLS = 13,903, citation = 495) are the two most co-cited journals. They often act as hubs, as integrating hubs, thethe integrating results of of results OR, TRTR OR, and SCM and SCM with social, with environment social, environmentor or economic implications economic to implications provide to cross-domain provide cross-domainknowledge knowledge crucial to the crucial diverse to the development diverse development of G&SL. of G&SL. Figure Figure 4. 4. Mapping Mappingof ofthe thejourn als co-c journals ited. co-cited. 3.3. Countries/Organizations 3.3. Countries/Organizations Collaboration Collaboration Analysis Analysis Table 2 2lists Table the the lists countries or regions countries that are that or regions actively arestudying activelyG&SL, showing studying six measurements, G&SL, showing six including number of publications (NP), TLS, average citation year, total citations, measurements, including number of publications (NP), TLS, average citation year, total average citation per citations, country/region, and average normalized citation. The average normalized citation average citation per country/region, and average normalized citation. The average normalized was calculated by dividing citation was the total number calculated of citations by dividing by the the total average number number by of citations of citations the averagepublished numberperof year [34]. citations Figure 5 displays the collaboration network among countries and regions. The minimum published per year [34]. Figure 5 displays the collaboration network among countries and regions. number of documents and citations for a country was set at 5 and 30 respectively. Finally, The minimum number of documents and citations for a country was set at 5 and 30 respectively. a map with 25 items and 58 links Finally, a map was withgenerated. 25 items and 58 links was generated. Table 2. Summaries of countries/regions active in G&LS research. Ave. Total Ave. Ave. Norm. Country/Region Territory NP TLS Year Citations Citation Citation China Mainland Asia 49 36 2017 234 4.78 0.57 United States North America 41 30 2012 1388 33.85 1.28 England Europa 24 28 2014 488 20.33 1.16 Sweden Europa 19 0 2014 300 15.79 0.88 India Asia 16 6 2018 90 5.63 1.07 Spain Europa 16 6 2014 355 22.19 0.86 Italy Europa 15 18 2017 284 18.93 1.68 The Netherlands Europa 13 18 2011 524 40.31 1.33 Germany Europa 13 10 2014 116 8.92 0.71 Canada North America 12 14 2014 285 23.75 0.98 France Europa 12 12 2014 203 16.92 0.86 Hong Kong Asia 10 12 2018 394 39.4 1.53 Taiwan Asia 10 8 2017 456 45.6 1.47 Singapore Asia 9 16 2017 214 23.78 1.64 Belgium Europa 8 6 2014 152 19 1.18 Portugal Europa 8 4 2013 112 14 1.09
Int. J. Environ. Res. Public Health 2020, 17, 261 8 of 25 Table 2. Summaries of countries/regions active in G&LS research. Ave. Total Ave. Int. J.Country/Region Environ. Res. Public Health 2020, 17, x FOR PEER Territory NP REVIEW TLS Ave. Year Norm.8 of 25 Citations Citation Citation Greece China Mainland Europa Asia 8 49 636 2015 2017 326 234 46.57 4.78 0.92 0.57 United States North America 41 30 2012 1388 33.85 1.28 England to Table 2, According Europa G&SL research 24 is widely 28 2014 distributed, 488 especially 20.33 Asia, and in Europe, 1.16 North Sweden Europa 19 0 2014 300 15.79 America, which is a field of worldwide concern. Mainland China has the most publications, but the 0.88 India Asia 16 6 2018 90 5.63 1.07 United States Spain has the highest Europatotal citation. 16 Other 6 countries/regions 2014 355such as Italy, 22.19 Singapore, 0.86 Hong Kong, and Taiwan present Italy a lower number Europa 15 of publications; 18 2017 however, 284they keep18.93 significant 1.68 figures of The Netherlands average Europa normalized citation which can13strongly 18 express2011their high524influence.40.31 1.33 of the Besides, most Germany Europa 13 10 2014 116 8.92 0.71 documents contributed by these countries/regions were published in the last three years, which Canada North America 12 14 2014 285 23.75 0.98 means they Franceare playing an increasingly12active 12 Europa role in promoting 2014 G&SL. 203 16.92 0.86 Two Hongevidence Kong can beAsia observed from10 Figure 12 5. First, 2018based on394 a partnership, 39.4 the global 1.53 G&SL researchTaiwan is divided into Asia 10 four communities. 8 Therein, 2017 456 two communities are 45.6 1.47 leaded by European Singapore Asia 9 16 2017 214 23.78 1.64 counties, such as UK, Spain, Belgium Europa The Netherlands, 8 6 and 2014 Italy, while 152 the other two 19 communities 1.18 are “Mainland China-Hong Portugal Kong-Singapore” Europa 8 and4 “United 2013 States-India-Australia-Portugal-Taiwan”, 112 14 1.09 dominated by China andEuropa Greece USA, respectively. 8 6 2015 326 46.57 0.92 Figure Figure 5. Mapping of 5. Mapping of countries/regions countries/regions contribute contribute to to G&SL G&SL research. research. According to Table 2, G&SL research is widely distributed, especially in Europe, Asia, and North Second, the international collaboration is not significant. Taking mainland China for instance, America, which is a field of worldwide concern. Mainland China has the most publications, but the about 70 percent of 49 publications are completed entirely by domestic institutions. The Swedish United States has the highest total citation. Other countries/regions such as Italy, Singapore, Hong Kong, publications do not have any co-authors from other countries or regions. This phenomenon may be and Taiwan present a lower number of publications; however, they keep significant figures of average due to the large differences in the background and model of G&SL development in different countries normalized citation which can strongly express their high influence. Besides, most of the documents [35]. Moreover, the knowledge gap caused by the wide extension of G&SL and the scattered contributed by these countries/regions were published in the last three years, which means they are knowledge structure make the research still focus on the respective fields of researchers, such as playing an increasingly active role in promoting G&SL. sustainable development [36], environment governance [37] and transportation planning [38]. Two evidence Therefore, canthe at present, be cooperation observed from Figureacademic between 5. First, based on a partnership, institutions the global G&SL of different backgrounds has research not beeniswidely divided into four carried out.communities. Therein, two communities are leaded by European counties, Among the 402 organizations that contributed to G&SL research, those with more than five documents and over 30 citations were built into a network of 22 items and 22 links, as shown in Figure 6. None of the organizations published more than 10 papers (3% of 306) and the studies were relatively independent. Therefore, it can be argued that no organization has yet been able to lead G&SL research so far. However, some of the institutions located in Asia Pacific and Europe have a
Int. J. Environ. Res. Public Health 2020, 17, 261 9 of 25 such as UK, Spain, The Netherlands, and Italy, while the other two communities are “Mainland China-Hong Kong-Singapore” and “United States-India-Australia-Portugal-Taiwan”, dominated by China and USA, respectively. Second, the international collaboration is not significant. Taking mainland China for instance, about 70 percent of 49 publications are completed entirely by domestic institutions. The Swedish publications do not have any co-authors from other countries or regions. This phenomenon may be due to the large differences in the background and model of G&SL development in different countries [35]. Moreover, the knowledge gap caused by the wide extension of G&SL and the scattered knowledge structure make the research still focus on the respective fields of researchers, such as sustainable development [36], environment governance [37] and transportation planning [38]. Therefore, at present, the cooperation between academic institutions of different backgrounds has not been widely carried out. Among the 402 organizations that contributed to G&SL research, those with more than five documents and over 30 citations were built into a network of 22 items and 22 links, as shown in Figure 6. None of the organizations published more than 10 papers (3% of 306) and the studies were relatively independent. Therefore, it can be argued that no organization has yet been able to Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW lead G&SL research so far. However, some of the institutions located in Asia Pacific and Europe9 of 25 have a higher reputation in G&SL due to higher citations, including the Hong Kong Polytechnic (Hong Kong, 388 university (Hong citations), Kong, 388Wageningen UniversityUniversity citations), Wageningen (The Netherlands, 370 citations), (The Netherlands, Aristotle 370 citations), University Aristotle University of Thessaloniki (Greece, 324 citations), National Chiao Tung University (Taiwan, 330 of Thessaloniki (Greece, 324 citations), National Chiao Tung University (Taiwan, citations), Iowa State 330 citations), IowaUniversity (USA,(USA, State University 206 citations), University 206 citations), UniversityCalifornia CaliforniaBerkeley Berkeley (USA, (USA, 160 citations) and Nanyang 160 citations) Technological and Nanyang University Technological (Singapore, University 137137 (Singapore, citations). citations).InInaddition, addition,Figure Figure 6 also also shows insufficient collaborative research across shows insufficient collaborative research across organizations. organizations. Figure 6. Mapping of global collaboration network among organizations. Figure 6. Mapping of global collaboration network among organizations. 3.4. Influential Research Highlight Through the document co-citation test of the portfolio, the most influential G&SL publications in the past two decades were analyzed and the co-citation network was constructed. In VOSviewer, the minimum number of citations was set to 30 to build a co-cited visual network map of 83 items
Int. J. Environ. Res. Public Health 2020, 17, 261 10 of 25 3.4. Influential Research Highlight Through the document co-citation test of the portfolio, the most influential G&SL publications in the past two decades were analyzed and the co-citation network was constructed. In VOSviewer, the minimum number of citations was set to 30 to build a co-cited visual network map of 83 items and 350, as shown in Figure 7. The nodes in the map denote the documents that were identified by the first author name and the publication year. The colors of the nodes and the links represent the time of publication and the time of two documents that are co-cited, respectively. The co-occurrence of the literature shows an obvious type of “local concentration and overall dispersion”, indicating that some G&SL studies were widely recognized and produced some common ideas and results. Most Int. J. Environ. papers withRes. Public high Health appeared citation 2020, 17, x FOR PEER 2010, around REVIEW 10 of which was a landmark year for G&SL research. The25 co-citation time series indicate that G&SL knowledge spreads faster and faster. Figure 7. Mapping of the influential documents and their co-citation relationship. Figure 7. Mapping of the influential documents and their co-citation relationship. The top 15 most cited papers are presented in Table 3, showing their publication year, title, TLS, Thecounts citation top 15and most citedThe topics. papers mostare presented cited study was in Table 3, showing by Dekker their et al. [39], onepublication year, title, TLS, of the first methodological citation studies to link the operations research knowledge (such as design, planning, and control)ofto the counts and topics. The most cited study was by Dekker et al. [39], one first the field methodological of green logistics. studies to linkisthe The second Sheuoperations et al. [40],research knowledge whose main (such as contribution design, is to propose planning, a modelingand control) to the field of green logistics. The second is Sheu et al. [40], whose technique for sustainable logistics operations and management decisions to maximize supply chain main contribution is to propose a modeling technique for sustainable logistics operations and profits. These were followed by papers by Lai and Wong [41] and Ubeda et al. [42], which focused management decisions to maximize on using the supply chain profits. scenario-based These were approaches, followed such as theby papers by Lai questionnaire andand Wong case [41]toand study, Ubedathe evaluate et al. [42], which focused on using the scenario-based approaches, such as the environmental performance of green logistics practices. The main topics of other highlighted documentsquestionnaire and case study, involve:to(i)evaluate managementthe environmental performance insights from industrial of green practices logistics [43,44]; practices. The (ii) multi-criteria main topics evaluation systemof other highlighted documents involve: (i) management insights from industrial practices for green logistics (e.g., policy [45], environment [46], and transportation planning [47]); (iii) network [43,44]; (ii) multi-criteria facilities designevaluation system[48,49]; and optimization for green logistics (iv) reverse (e.g.,[50,51]; logistics policyand [45], (v) environment [46], and enterprise responsibility transportation and third-partyplanning [47]); (iii) network facilities design and optimization [48,49]; (iv) reverse logistics [52]. logistics [50,51]; and (v) enterprise responsibility and third-party logistics [52]. Table 3. List of publications with the highest impact in G&SL. Topic Related Document Year Title TLS Citation to G&SL Operations research for green logistics - Dekker et al. Operations 2012 An overview of aspects, issues, 100 330 [39] research
Int. J. Environ. Res. Public Health 2020, 17, 261 11 of 25 Table 3. List of publications with the highest impact in G&SL. Topic Related Document Year Title TLS Citation to G&SL Operations research for green logistics - Dekker et al. Operations 2012 An overview of aspects, issues, 100 330 [39] research contributions, and challenges Sheu et al. An integrated logistics operational model Operations 2005 20 260 [40] for green supply chain management research Green logistics management and Lai and Wong Management 2012 performance: Some empirical evidence 82 167 [41] practices from Chinese manufacturing exporters Ubeda et al. Management 2011 Green logistics at Eroski: A case study 52 146 [42] practices Sarkis et al. Reverse 2010 Reverse logistics and social sustainability 104 128 [50] logistics Frota Neto et Designing and evaluating sustainable Operations 2008 22 128 al. [11] logistics networks research Murphy and Green perspectives and practices: a Management 2003 78 118 Poist [34] “comparative logistics” study practices Lin and Ho Determinants of green practice adoption Systematic 2011 48 115 [45] for logistics companies in China evaluation Credibility-based fuzzy mathematical Pishvaeee et Operations 2012 programming model for green logistics 24 114 al. [48] research design under uncertainty A strategic sustainability justification Presley et al. Reverse 2007 methodology for organizational 46 91 [51] logistics decisions: a reverse logistics illustration Murphy and Green logistics strategies: An analysis of Management 2000 62 90 Poist [44] usage patterns practices Lieb and Lieb Environmental sustainability in the Environmental 2010 0 87 [52] third-party logistics (3PL) industry impact Environmental assessment of freight Environmental Hovath [46] 2006 12 83 transportation in the US impact A hybrid approach integrating Affinity Awathi et al. Systematic 2012 Diagram, AHP and fuzzy TOPSIS for 18 74 [47] evaluation sustainable city logistics planning The design of sustainable logistics Operations Lee et al. [53] 2010 24 73 network under uncertainty research 3.5. Keywords Co-Occurrence Analysis The keywords co-occurrence analysis was conducted to describe the internal composition and structure of G&SL and to reveal the frontiers [31]. The options “All Keywords” and “Full Counting” in VOSviewer analysis were checked to obtain a holistic intellectual landscape of G&SL research. Before the scientometric test, the keywords, such as “third-party logistics providers” versus “3PL”, “transport” versus “transportation”, which are necessary due to differences in expression, were manually simplified on the original data file. The minimum occurrences of each keyword was set to 4, forming a network of 112 nodes representing keywords (1455 keywords in all documents) and 2067 links, as shown in Figure 8.
Int. J. Environ. Res. Public Health 2020, 17, 261 12 of 25 Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW 12 of 25 Figure 8. Mapping of co-occurred Figure8. co-occurred keywords. keywords. Figure Figure88displays displays thethe mainstream mainstream of of research research keywords keywords in in G&SL G&SL and and their their co-occurrence co-occurrence relationships. relationships.Divide Divide these these keywords keywords into into four four clusters clustersandanddistinguish distinguishthem themwithwithdifferent differentcolors. colors. Therein, Therein, Cluster #1 contains Cluster #1 contains18 items focusing 18 items on the practice focusing on the and management practice of logistics sustainability and management of logistics (e.g., collaboration, sustainability case study and (e.g., collaboration, caseintermodal transportation), study and intermodal while Cluster transportation), while#2Cluster covers#225coversitems, 25 items, concentrating concentrating on the environmental on the environmental issues of issues freightoftransport, freight transport, such assuchcarbonas carbon emission,emission, energy energy consumption consumption and assessment. and lifecycle lifecycle assessment. Cluster #3 Cluster #3 (34 (34 items) anditems) and#4Cluster Cluster #4 (34 (34 items) items) emphasize onemphasize the “model, on planning the “model, andplanning and optimization” optimization” as well as theas“supply well as chain the “supply chain performance, performance, development development strategy strategy and competitiveness”, and competitiveness”, respectively. respectively. Table 4 shows the detailed information of Table 4 shows the detailed information of the the significant keywords. keywords.The Thetoptop10 10most mostfrequently frequently studiedand studied andhighly highly connected connected terms termsare aresustainability sustainability (Feq. (Feq. = TSL = 80, = green = 547), 80, TSL supplysupply 547), green chain (Feq. chain = 68, TSL = 629), management (Feq. = 58, TSL = 411), model (Feq. = 55, TSL (Feq. = 68, TSL = 629), management (Feq. = 58, TSL = 411), model (Feq. = 55, TSL = 394), green = 394), green logistics (Feq. = 48, TSL logistics = 325), (Feq. performance = 48, TSL = 325),(Feq. = 47, TSL =(Feq. performance 367),=logistics 47, TSL(Feq. = 367),= 46, TSL = 299), logistics (Feq.framework = 46, TSL = (Feq. 299), = 43, TSL = 356), impact (Feq. = 41, TSL = 312) and reverse logistics (Feq. framework (Feq. = 43, TSL = 356), impact (Feq. = 41, TSL = 312) and reverse logistics (Feq. = 39, = 39, TSL = 323). These keywords TSL = 323). play Thesea critical keywords role play in forming a criticalG&SL role research in formingtopics andresearch G&SL connecting major topics andbranches connecting of knowledge. According to the metric of average citations, the following major branches of knowledge. According to the metric of average citations, the following keywords, keywords, including transportation, including environmental transportation, sustainability, environmental production,production, sustainability, reverse logistics, reverseand efficiency, logistics, andaroused a efficiency, lot of attention. aroused a lot of attention.
Int. J. Environ. Res. Public Health 2020, 17, 261 13 of 25 Table 4. Summaries of significant keywords and theme clusters of G&SL research. Ave. Ave. Norm. Cluster ID Keywords Occurrence TLS Time Span Citation Citation Sustainability 80 547 13.9 1.2 2007–2019 Management 58 411 16.6 0.9 2001–2019 Impact 41 312 18.4 1.1 2008–2019 Logistics 46 299 19.1 1.1 2003–2019 Cluster #1 Systems 37 260 19.3 1.2 2004–2019 (purple) Case study 14 108 29.6 1.1 2008–2019 Size = 335 Efficiency 14 108 32.7 1.3 2013–2019 China 12 88 27.9 0.8 2011–2019 Intermodal 12 88 5.2 0.6 2017–2019 transportation Collaboration 11 73 12.7 0.8 2013–2019 Stakeholder 10 71 8.2 1.2 2017–2019 Freight transportation 38 223 15.3 1.1 1999–2019 Carbon emission 31 197 13.8 1.1 2007–2019 City logistics 29 118 12.7 1.1 2010–2019 Cluster #2 Policies 14 94 24.5 1.1 2005–2019 (green) Costs 13 92 11.7 0.7 2008–2019 Size = 169 Energy consumption 13 72 8.7 0.7 2009–2019 Electric vehicles 11 74 16 1.4 2015–2019 Lifecycle assessment 10 68 22.2 1.6 2017–2019 Modal shift 10 54 6.6 0.8 2017–2019 Model 55 394 24.2 1.2 2004–2019 Reverse logistics 39 323 35.7 1.4 2004–2019 Transportation planning 17 125 6.1 1.4 2015–2019 Decision-making 16 132 19.5 1.6 2009–2019 Cluster #3 Optimization 16 122 24.9 1.1 2012–2019 (red) Closed-loop logistics 12 118 14 1.2 2011–2019 Size = 202 Network design 12 94 27.1 0.9 2011–2019 Production 12 75 37.5 0.7 2005–2019 Transportation 12 106 52.1 1.8 2008–2019 Vehicle routing problem 11 74 31.1 1.5 2023–2019 Green supply chain 68 629 23.4 1.1 2005–2019 Green logistics 48 325 21.9 0.9 2008–2019 Performance 47 367 17.7 0.9 2011–2019 Framework 43 356 18.9 1.1 2007–2019 Industry 29 260 20.4 1.1 2009–2019 Third-party logistics 27 206 11.5 1.5 2013–2019 Cluster #4 service providers (3pl) (blue) Environmental 26 189 42 1.5 2003–2019 Size = 422 sustainability Sustainable 26 191 15.6 1.1 2010–2019 development Environment 24 21 15.7 0.7 2009–2019 Strategy 20 139 23.1 1.3 2004–2019 Operations 17 137 12.6 0.8 2011–2019 Urban 13 65 8.1 1.2 2015–2019 Environmental 12 93 27.5 1.3 2012–2019 performance Competitive advantage 11 88 30.5 1.3 2011–2019 Social responsibility 11 106 26.3 1.6 2013–2019 Keyword co-occurrence network is a static expression of a particular area that does not take into account changes over time in the manner that the terms are used [54]. Figure 9 shows a time zone view of keywords that occur more than eight from 1999 to 2019. Each term is arranged in chronological order
Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW 14 of 25 Keyword Int. J. Environ. Res. co-occurrence Public Health 2020,network 17, 261 is a static expression of a particular area that does not take into 14 of 25 account changes over time in the manner that the terms are used [54]. Figure 9 shows a time zone view of keywords that occur more than eight from 1999 to 2019. Each term is arranged in to present the trend chronological and order to interaction present of keywords. the trend Studies and interaction on management, of keywords. Studiesmodel and green supply on management, model chains had been published extensively before 2005 and had been going for a long and green supply chains had been published extensively before 2005 and had been going for a longtime, showing that these time, early topics showing arethese that still the hotspots early topicsof current are research. still the In contrast, hotspots of currentarticles related research. to collaboration, In contrast, articles transportation planning, modal shift and stakeholder were published from 2015 related to collaboration, transportation planning, modal shift and stakeholder were published to 2017, whichfrom are emerging themes discussed frequently in recent years and may become the hotspots 2015 to 2017, which are emerging themes discussed frequently in recent years and may become the of future research. Additionally, a large hotspots of future proportion research. of the keywords Additionally, were proposed a large proportion of thebetween keywords 2007 and were 2015, indicating proposed between that 2007 and 2015, indicating that G&SL research was greatly enriched during this time G&SL research was greatly enriched during this period. Table 4 presents the span period. of all4 Table highlighted presents thekeywords. time span of all highlighted keywords. Figure 9. Figure 9. A A time time zone zone view view of of clustered clustered research research themes: themes: 1999-2019. 1999-2019. 4. 4. Discussion 4.1. 4.1. Knowledge Knowledge Taxonomy Taxonomy of of Current Current Research Research Through Throughthe theaforementioned aforementioned analysis, the research analysis, progress, the research evolutionary progress, trend, and evolutionary hot-discussed trend, and hot- topics of global G&SL are clarified. However, the generic scientometric results cannot discussed topics of global G&SL are clarified. However, the generic scientometric results cannot accurately reflect the explicit reflect accurately divisiontheofexplicit the multifarious division ofknowledge of a domain the multifarious [31]. Based knowledge on the clustering of a domain [31]. Based analysis on the of high-frequency keywords, a comprehensive taxonomy of G&SL knowledge clustering analysis of high-frequency keywords, a comprehensive taxonomy of G&SL knowledge from 1999 to 2019 was further proposed, and each separated branch was thematically discussed in-depth from 1999 to 2019 was further proposed, and each separated branch was thematically discussed in- subsequently. Topics with depthsimilar attributes subsequently. were with Topics integrated similarinto different attributes categories were of themes integrated and manually into different categoriesrenamed of themesto make the taxonomy more compact and easy to understand. Figure 10 demonstrates and manually renamed to make the taxonomy more compact and easy to understand. Figure 10 the mind mapping of G&SL research demonstrates themes, the mind whereofa G&SL mapping total ofresearch 5 alignments themes,and 50 sub-branches where are assembled. a total of 5 alignments The and 50 sub- number of representative articles of each theme was also attached. branches are assembled. The number of representative articles of each theme was also attached.
Int. J. Environ. Res. Public Health 2020, 17, 261 15 of 25 Int. J. Environ. Res. Public Health 2020, 17, x FOR PEER REVIEW 15 of 25 Figure10. Figure 10.The The knowledge knowledge taxonomy taxonomy of of G&SL G&SLthemes. themes. 4.1.1. 4.1.1. Evaluationon Evaluation onthe theSocial, Social,Environmental Environmental and and Economic Economic Impacts Impactsof ofG&SL G&SLInitiatives Initiatives Nearlya aquarter Nearly quarterofofthe theliterature literature(71(71 out out of of 306 306 papers) papers) focused focused on onevaluating evaluatingand andquantifying quantifying how the potential green logistics initiatives improve the “triple bottom how the potential green logistics initiatives improve the “triple bottom line” (i.e., social, environmental line” (i.e., social, environmental and economic performance, SEE) of existing freight and economic performance, SEE) of existing freight activities. The subjects of these studies activities. The subjects of these were studies originated basically were basically from originated four aspects: from four emission, carbon aspects: carbonenergyemission, consumption, energy consumption, social sustainability, social and sustainability, and external cost-and-benefit. Mattila and Antikainen external cost-and-benefit. Mattila and Antikainen [15] provided a backcasting method for the long-term [15] provided a backcasting method for prediction the long-termgas of greenhouse prediction emissions of greenhouse and fossil fuel gasconsumption emissions andinfossil fuel consumption long-distance in long- freight transport, considering the sustainable goals and policies developed by the EU governments. Similarthe distance freight transport, considering the sustainable goals and policies developed by EU research governments. Similar research was conducted for assessing the U.S. scenario [46]. A questionnaire was conducted for assessing the U.S. scenario [46]. A questionnaire survey conducted by Makan and survey conducted by Makan and Heyns [55] found that the pressures from consumer, brand Heyns [55] found that the pressures from consumer, brand protection, top management, and cost-saving protection, top management, and cost-saving and revenue are the major drivers for freight and revenue are the major drivers for freight organizations to implement the sustainable initiatives. organizations to implement the sustainable initiatives. Khan et al. [56] modeled the impact of G&SL Khan et al. [56] modeled the impact of G&SL performance on the countries’ economic development performance on the countries’ economic development and macro-level social and environmental and macro-level social and environmental indicators. Papoutsis et al. [57] and Solomon et al. [58] indicators. Papoutsis et al. [57] and Solomon et al. [58] both maintained that logistics sustainability is both maintained closely related tothat logisticsefficiency operational sustainability is closely and social related acceptance to operational from an economicefficiency and social and environmental acceptance perspective. Through the expert scoring, Morana and Gonzalez-Feliu [59] identified theMorana from an economic and environmental perspective. Through the expert scoring, most and Gonzalez-Feliu [59] identified the most prominent factors affecting prominent factors affecting the sustainability of urban logistics are monetary saving, services quality,the sustainability of urban logistics are monetary saving, services quality, and customers’ satisfaction and customers’ satisfaction rate (economic), pollution emissions and congestions (environmental), rate (economic), pollution emissions and congestions and the number of employment (environmental), created/destroyed and (social). the number Socialof andemployment environmental created/destroyed activities play (social). a moreSocial importantand environmental role in promoting activities play alogistics sustainable more important role in promoting than financial-economic sustainable activities [60]. logistics Rashidithanand financial-economic Cullinane [61] found activities that the [60]. Rashidi national and industry logistics Cullinane [61]high with found SEEthat thehas index national the logistics industry with high SEE index has the following features: (i) well-planned following features: (i) well-planned logistics network infrastructure; (ii) high quality of service logistics network infrastructure; operators; (iii) (ii)shipments high quality of service tracing operators; technology; (iii) efficient and (iv) shipments tracingscheduling. timetable technology; and (iv) efficient timetableAnother part of emphasis was given to SEE performance of G&SL based on logistics operations scheduling. andAnother business. Guo part ofand Ma [62]was emphasis evaluated given to theSEE energy consumption performance and emission of G&SL based on level underoperations logistics different andlogistics business.business Guo and modes, Ma concluding [62] evaluated thatthethe energy third-party logistics provider consumption and emission and the joint level distribution under different modes business logistics have obvious modes, environmental concluding advantages in developing that the third-party green logistics urban distribution. provider and the jointWang et al. distribution [63] found that green logistics performance would impose positive effects modes have obvious environmental advantages in developing green urban distribution. Wang et al. [63] to the exporting countries in thethat found international green logistics trade.performance Herold and would Lee [64]impose investigated positivetheeffects carbontoreports disclosedcountries the exporting by somein thegiant international international logistics trade. Heroldenterprises, and Lee [64]e.g., investigated UPS, FedX and theDHL, carbonandreports compared their sustainability- disclosed by some giant
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