See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/371628201 A BIBLIOMETRIC REVIEW OF EDUCATION FOR SUSTAINABLE DEVELOPMENT RESEARCH LANDSCAPE FROM 1991 TO 2021 Preprint · June 2023 DOI: 10.31219/osf.io/q4tza CITATIONS READS 0 66 3 authors, including: Ngoc-Thang B. Le Tung Ho Ritsumeikan Asia Pacific University Phenikaa University 16 PUBLICATIONS 15 CITATIONS 251 PUBLICATIONS 2,276 CITATIONS SEE PROFILE All content following this page was uploaded by Ngoc-Thang B. Le on 24 November 2023. The user has requested enhancement of the downloaded file. SEE PROFILE A BIBLIOMETRIC REVIEW OF EDUCATION FOR SUSTAINABLE DEVELOPMENT RESEARCH LANDSCAPE FROM 1991 TO 2021 Ngoc-Thang B. Le1; Manh-Tung Ho1,2,3* 1. Ritsumeikan Asia Pacific University, Beppu, Oita, Japan, 874-8577 2. Centre for Interdisciplinary Social Research, Phenikaa University, Yen Nghia Ward, Ha Dong District, Hanoi, 100000 3. Institute of Philosophy, Vietnam Academy of Social Sciences, 59 Lang Ha Street, Ba Dinh District, Hanoi, 100000 *Correspondence: Manh-Tung Ho (tung.homanh@phenikaa-uni.edu.vn) Abstract This paper sought to understand the research landscape of education for sustainable development (ESD) globally from 1991 to 2021. Applying bibliometric analysis on 632 papers indexed in the Web of Science database, we examined the structure of research on ESD. While productivity has peaked in recent years, the impact of the articles in this field remains relatively medium. The four most impactful publishing journals are Sustainability, Journal of Cleaner Production, International Journal of Sustainability in Higher Education, and Environmental Education Research. We find research in ESD is still dominated by Western European authors, although collaboration with Asia, South Africa, North and South America are recorded to be on the rise. The bibliometric analysis and a comprehensive review help synthesize key findings regarding students’ attitudes and perceptions toward ESD, ESD in higher education, and competency-based education. Importantly, this study identifies the shift from content-based education toward interactive and participatory style of pedagogy for successful ESD integration at all levels of education. There are several emerging research themes such as policy impacts and ESD programs analyses, which can provide high-value actionable insights for both educators and policymakers. The review brings into sharp relief an overarching sense of positivity regarding sustainability education among the students, yet equally, they feel a lack of concreteness and practicality in the current curriculum. Key words: Education for sustainable development, sustainability competency, student perception of ESD, participatory pedagogical approach, ESD in higher education 1. Introduction Education for Sustainable Development (ESD) has been relevant in the literature as an innovative educational agenda to promote the learning and practice of sustainable development. Over a decade ago, Walter (2010) discussed how the integration of ESD into educational programs had brought various values to the pedagogical process in Western Europe. By connecting sustainability knowledge with specialized education in England, engineers, architects, and other professionals would consider the aspect of sustainability in construction and renovation. Germany, being one of the most active countries in integrating ESD into its curriculum, went beyond the teaching of sustainable development in specialized education major to management-oriented and business study. In Finland, Sweden, and Poland, sustainability inclusion in engineering had given way to the design of sustainable production, notably NOKIA’s manufacturing chain in Finland and Volvo- Scania’s environment-friendly cars (Walter, 2010). In Japan, ESD was strongly promoted by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) (Nomura & Abe, 2010). MEXT revised the curriculum to implement ESD-related topics into education systems while providing funds for UNESCO to expand the practice of ESD to the AsiaPacific region. Although China didn’t have any national education program that placed ESD at its core, the concept underwent a culturalized process, integrating Chinese core educational values to fit into the concepts of ESD (Müller et al., 2021; Zhou & Lee, 2022). On the other hand, while the agenda was promoted as an innovative educational goal, its state of research and implementation approach remains limited (Kopnina, 2012, 2020; Nagata, 2017). As research is an essential source of references for educational institutions and government officials to plan for ESD practice at all levels of education, this paper will analyze the ESD research landscape from 1991 to 2021. Utilizing bibliometric data on the ESD research landscape, we will provide a bibliometric and comprehensive thematic review. By the end of the study, the paper will provide insights into the current research state and future direction for ESD-theme research, through which educators and policymakers can have a better understanding of ESD before implementing new activities. The structure of the paper is as follows: Section 2 will present a brief description of the ESD agenda proposed by the United Nations, and how our study differs from previous studies with similar review approaches. Section 3 will describe how we collected and processed the bibliometric data on the ESD research. Section 4 will show the overview of the ESD research landscape, publisher and references’ sources, the authors’ characteristics, and a general thematic review. Section 5 will elaborate on the findings of section 4, providing comprehensive thematic reviews on four themes, namely motor, basic, niche, and emerging/declining. Section 6 will conclude the paper with research limitations and significant remarks. 2. Literature review 2.1. Education for Sustainable Development Simply put, ESD is defined as the collective transformation of education for educators to work toward a sustainable society. Tracing back its history, ESDs was first proposed by Japan at the 2002 World Summit on Sustainable Development. UNESCO took the leading position in expanding the concept and development framework for ESD, through its program “UN Decade of Education for Sustainable Development (DESD)” from 2005 to 2014 and “Global Action Program on Education for Sustainable Development (ESD) (GAP)” from 2015 to 2019. Both programs were founded based on the principle that education is one of the most essential elements for promoting sustainable development’s pathway. While the concept of sustainable society is ambiguous, the transformation pathways for ESD have been defined by UNESCO in the ESD for 2030 roadmap (UNESCO, 2020). ESD for 2030 is based on three dimensions: (1) Cognitive learning - Explore innovative ideas and alternative solutions to understand sustainability challenges and their complex interconnections (2) Social and emotional learning - Develop sustainable fundamental beliefs and pro-sustainability competencies; and foster empathy and compassion for the people and the environment (3) Behavioral learning – Aware of effective and responsible actions towards a more peaceful and sustainable society at the local, national, and global levels (UNESCO, 2019, 2020). The three dimensions are at the core of not only the ESD but general awareness of the Sustainable Development Goals (SDGs), which will be discussed later. To achieve such goals, UNESCO proposed three reflections (UNESCO, 2020). Firstly, learners need to recognize the significance of individuals when it comes to transformative action. In the course of pursuing ESD, learners must understand that their actions collectively will bring great changes to maintain a sustainable society. Secondly, there are systemic issues in the societal structure that contributes to unsustainable development, namely bad governance, perpetual poverty, climate change, etc. Not only does ESD need to emphasize the understanding of these issues, but it also calls for learners to come up with alternatives to adjust the societal structures. Finally, while the role of technology in maintaining a sustainable society is undeniable, relying on technological advancement for solving sustainability challenges is dangerously naïve. Critical thinking and pro-sustainability competencies must remain the main objective of ESD learners. 2.2. Review on Education for Sustainable development Bibliometric review is a powerful tool to understand the research state of a field. It highlights the structural interests of the researchers and provides an insight into the current development of a field. Machado and Davim (2022) applied the bibliometric approach to answer three questions with regard to higher education for sustainability, identifying the main themes of research, the most contributing researchers, and the countries with dominant outputs. In this study, bibliometric data was collected from the Scopus database, and the results were visualized with VOS viewer and Bibliometrix R package. Another study by Côrtes and Rodrigues (2016) used the bibliometric approach to understand the research trend of education for sustainability. The review included international productivity of research on education for sustainability, productive countries, and methods that were used to conduct studies in this field. Another review method to grasp an understanding of a research landscape is systematic review. This method differs as the review is conducted only a number of papers that carefully match the criteria and scope of the research questions. Bascopé et al. (2019) wrote a systematic review on the ESD for early children development (ECD). With the objective to understand pedagogical approaches and frameworks behind them, the paper examined a total of 56 articles, through which the authors identified the cornerstones for the ESD activities integration and suggested suitable pedagogical approaches for ESD. Wu and Shen (2016) utilized the systematic approach to write a review on higher education for sustainable development (HESD) during the UN’s Decade of Education for Sustainable Development (DESD). The research systematically collected articles from 4 large databases (EBSCO, ProQuest, ScienceDirect, Emerald) through three synonymous keywords: “education for sustainability”, “education for sustainable development”, and “sustainability education”. As a result, the paper presented a chronological mapping of theme development and detailed discussion in main themes, notably sustainability and the environment in higher education, curriculum, and teaching sustainability. With a similar approach, our study sought to update the development progress of the ESD research landscape up until 2021. Employing the pre-established bibliometric reviewing structure, this study will seek to analyze notable bibliometric characteristics of the ESD research landscape to understand the development of the field. Furthermore, our study will differ from other bibliometric reviews by providing an insight into what the authors are researching, how they conduct the studies, and what outcome we can take from those studies. 3. Methodology For this bibliometric review, we have selected Web of Science database for its indexing reliability and convenient data exporting function. The data collection process is described in table 1: Step Query Results #1 “Education for sustainable development” (title) 1067 #2 “Education for sustainable development” (1989- 1051 2021) #3 “Education for sustainable development” (1989- 726 2021), Refined by Article #4 “Education for sustainable development” (1989- 632 2021), Refined by Article, English. Table 1: Search and filter query on Web of Science In the searching process, “Education for sustainable development” was the main keyword to yield as many results as possible while keeping the results relatively relevant to the research theme. From the initial 1067 articles, the results were refined through the publication year for a complete and accurate comparison of scientific productivity in the examined period. Finally, only papers with article as document type, and English as language were included in the dataset. This was to synchronize the bibliometric data collected from the articles, as other forms of publication might be lacking abstracts, keywords, and so on. We searched the keyword in only the title, as otherwise collected research papers won’t match closely to this paper’s objective, for instance, study on Education with Sustainable development in the title or keyword. In the next step, we applied bibliometric analysis with bibliometrix, an open-source package in R. The package was developed by Aria and Cuccurullo (2017) that allowed non-coding researchers to use its interface biblioshiny with multiple pre-programmed analyzing functions. Notable functions include analysis of overview, sources, authors, and documents. The package also offers more complex analyzing functions, which are conceptual, intellectual, and social structure analysis. The visualization and interpretation of the results from using bibliometrix package are presented in the following section. 4. Result 4.1. Overview Descriptive data Description Results MAIN INFORMATION ABOUT DATA Timespan 1991:2021 Sources (Journals, Books, etc) 227 Documents 632 Average years from 5.82 publication Average citations per 13.86 Average citations per year per 2.015 documents doc References 22489 DOCUMENT TYPES article 473 article; book chapter 141 article; proceedings paper 18 DOCUMENT CONTENTS Keywords Plus (ID) 579 Author's Keywords (DE) 1474 AUTHORS Authors 1454 Author Appearances 1718 Authors of single-authored 140 documents Authors of multi-authored 1314 documents AUTHORS COLLABORATION Single-authored documents 160 Documents per Author 0.435 Authors per Document 2.3 Co-Authors per Documents 2.72 Collaboration Index 2.78 Table 2. Description of the dataset Overall, there are 632 articles examined in this study, published between 1991 and 2021. The average years from publication are 5.82, while the average number of citations per document is 13.86. In total, there are 1454 authors contributing to the publications in the ESD field. Of the 1454 authors, 140 people are the sole contributors, accounting for approximately 9.63% of the total authors. The documents per author’s rate is 0.435 while the authors per document’s rate is 2.3. In other words, on average in this field, an author writes 0.424 paper while one publication is written by 2.3 authors. The collaboration index of 2.78 is calculated by dividing the total number of authors by the total number of documents in the multi-authored category, which suggests that one paper on the ESD topics is on average the collaborated effort of 2-3 authors. The metrics are in accordance with the co-authors per document’s rate (2.3) as well. Annual Scientific Production Figure 1. Annual Scientific Production of ESD research landscape The first article on the field of ESD was published in 1991. There were three periods when scientific productivity peaked: 2007-2009, 2011-2016, and 2018-2020. The annual growth rate is 19.84%. The vast majority of the publication is skewed to the right, suggesting that while the concept of this field has long been proposed, the research is receiving attention in the recent 15 years. The scientific productivity reached its highest in 2019, with 95 publications. Average article citations per year Figure 2. Average article citations of the ESD research landscape From figure 2, we can see that the publications on the ESD research landscape have vastly fluctuated citations over the years. The highest records are respectively 4.4, 3.8, and 5 in 2012, 2013, and 2015. Comparing with the highly skewed scientific production output of figure 1, we can presume that while the number of ESD-themed papers have increased, the impact of the articles in this field remains relatively medium. Three-fields plot Figure 3: Three-fields plot for countries (middle), sources (left), and cited sources (right) The three-field plot is based on the concept of interactive Sankey diagram (Riehmann et al., 2005), which allows users to trace quantitative flow across the graph and have a broad observation of complex flows. In this three-field plot, the top 10 of the authors’ countries, sources of the articles, and sources of the cited materials are displayed to indicate the flow of ESD-theme research papers from references to publications. A large volume of papers is published in Sustainability, Journal of Cleaner Production, International Journal of Sustainability in Higher Education, and Environmental Education Research. These publishers are also the main sources of references for ESD-themed research papers. Regarding authors’ countries, we can see a large proportion of papers are written by European researchers. Further insights into authors' and sources’ characteristics will be discussed in the following sections. 4.2. Publisher and References’ sources Top journals for article publication Figure 4. Top journals for publication in the ESD research landscape Figure 4 represents the top 20 journals with most articles from the ESD research landscape. Sustainability, an open-access journal, accounts for the largest proportion of papers in this field at 120 publications. The following journals with substantial numbers of publications are Environmental Education Research (55), International Journal of Sustainability in Higher Education (39), and Journal of Cleaner Production (32). Figure 5. Cumulative number of publications in the top 4 journals from 1991 to 2021 From the cumulative chart of publications in the top 4 journals with the highest ESD research papers, we can see the exponential growth of publications to Sustainability from 2018. Top journal for references Figure 6. Top journals for references of ESD research papers As mentioned in the overview, Sustainability (486), Environmental Education Research (1109), International Journal of Sustainability in Higher Education (763), and Journal of Cleaner Production (873) are not only the most popular journals for publication but also foundation journals for references in ESD research landscape. Top cited publications Paper Name and DOI Total TC per Citations Year LAMBRECHTS W, The integration of competences 208 2013, J 20.8 CLEAN for sustainable development in PROD higher education: an analysis of bachelor programs in management 10.1016/j.jclepro.2011.12.034 MOGENSEN 2010, F, The action competence approach 195 15 ENVIRON and the ‘new’ discourses of EDUC RES education for sustainable development, competence and quality criteria 10.1080/13504620903504032 KARATZOGLOU An in-depth literature review of 193 B, 2013, J CLEAN the PROD evolving roles 19.3 and contributions of universities to Education for Sustainable Development 10.1016/j.jclepro.2012.07.043 KOPNINA H, 2012, Education ENVIRON RES for sustainable 186 EDUC development (ESD): the turn away from ‘environment’ in environmental education? 10.1080/13504622.2012.658028 16.9091 BARTH M, 2012, J Academic staff development as a 174 CLEAN PROD 15.8182 catalyst for curriculum change towards education for sustainable development: an output perspective 10.1016/j.jclepro.2011.12.011 CEBRIAN G, 2015, Competencies in Education for 167 SUSTAINABILITY- Sustainable 20.875 Development: Exploring the Student Teachers’ BASEL Views 10.3390/su7032768 ANNAN-DIAB 2017, INT MANAG F, Interdisciplinarity: Practical 140 23.3333 J approach to advancing education EDUC- for sustainability and for the OXF Sustainable Development Goals 10.1016/j.ijme.2017.03.006 BURMEISTER M, Education 2012, CHEM EDUC Development RES PRACT for Sustainable 139 (ESD) 12.6364 and chemistry education 10.1039/c1rp90060a RAMOS TB, 2015, J Experiences CLEAN PROD from the 134 16.75 implementation of sustainable development in higher education institutions: Management Environmental for Sustainable Universities 10.1016/j.jclepro.2015.05.110 HUCKLE J, 2015, The UN Decade of Education for 127 ENVIRON RES EDUC Sustainable Development: business as usual in the end 10.1080/13504622.2015.1011084 15.875 BOEVE-DE PAUW The Effectiveness of Education 123 J, 15.375 2015, for sustainable Development SUSTAINABILITY- 10.3390/su71115693 BASEL LEAL W, 2015, INT The future we want: Key issues on 121 15.125 J SUST HIGHER ED sustainable development in higher education after Rio and the UN decade of education for sustainable development 10.1108/IJSHE-03-2014-0036 WIEK A, 2016, Operationalizing ROUT INT HANDB in Higher Competencies 112 Education 16 for Sustainable Development NA ADOMSSENT 2014, J M, Emerging areas in research on 108 12 CLEAN higher education for sustainable PROD development – education, management sustainable consumption and perspectives from Central and Eastern Europe 10.1016/j.jclepro.2013.09.045 AZEITEIRO 2015, J UM, Education for sustainable 102 12.75 CLEAN development through e-learning PROD in higher education: experiences from Portugal 10.1016/j.jclepro.2014.11.056 COTTON D, 2009, Revolutions and STUD HIGH EDUC education solutions: second‐best 94 for sustainable development in higher education 10.1080/03075070802641552 6.7143 BEYNAGHI 2016, J A, Future sustainability scenarios for 94 13.4286 CLEAN universities: moving beyond the PROD United Nations Education Decade for of Sustainable Development 10.1016/j.jclepro.2015.10.117 YUAN XL, 2013, J A critical assessment of the 92 CLEAN PROD 9.2 Higher Education For Sustainable Development from students' perspectives – a Chinese study 10.1016/j.jclepro.2012.10.041 ALAM GM, 2009, The SCI RES ESSAYS role of science and 86 6.1429 technology education at network age population for sustainable development through of human Bangladesh resource advancement NA FADEEVA Z, 2010, Higher education for today and 80 SUSTAIN SCI 6.1538 tomorrow: university appraisal for diversity, innovation and change towards sustainable development 10.1007/s11625-010-0106-0 Table 3. Articles with most citations Table 3 lists 20 articles with the highest total citations. Total citations per year are calculated by diving total citations by the number of years from the publication date until 2021. As the most impactful articles in the field, it can be said that the papers are essential for references to understand the directions of ESD research. Among those, many discussed the implementation of ESD in a specific country context. Notably, the countries examined are less developing regions, namely Bangladesh (Alam, 2009), China (Yuan & Zuo, 2013), and Central and Eastern part of Europe (Adomßent et al., 2014). The early paper in this group from 2009 highlighted the role of science and technology-based education for sustainable development in Bangladesh, a developing country with progressing economy. Thus, it reflects a strong desire for economic development, with education as an essential tool to advance the workforce capacity in the network age. Sustainable development in this context emphasized strongly the economic and social pillars of sustainable development. The next paper evaluates students’ awareness and perceptions of ESD (Yuan & Zuo, 2013) in the context of the Chinese education system. The findings confirmed a strong sense of environmental orientation toward sustainability, meaning students were prioritizing environmental aspects of sustainability over other pillars. In addition, the current transformation to incorporate sustainable development in Chinese universities was approached through a “top-down” notion, requiring changes from the university boards and governmental initiatives rather than from the students or staffs. Therefore, the bottom-up approach from students and university staffs was encouraged to address all the stakeholders in the educational system. In the Central and Eastern parts of Europe, Adomßent et al. (2014) focused on three ESD fields that the authors considered to be “highly relevant” emerging areas: Management education for sustainable development, sustainable consumption in higher education institutions, and higher education for sustainable development. In this special issue, the authors completed a comprehensive thematic review on the critical areas that previously have not received much attention. The important implications included prioritizing strategies for sustainable organizational transformation, assessing learning outcomes, and considering various geographical, political, and cultural settings for higher education for sustainable development. One important milestone of the ESD development is the UN Decade of Education for Sustainable Development (DESD). As the program was implemented from 2005 to 2014, many papers after 2014 reflected on the effectiveness of DESD. Leal Filho et al. (2015) discussed the success that DESD has gained in reaching for sustainable development with an emphasis on higher education. Leah Filho et al. (2015) emphasized the proposal to include three additional pillars of sustainable development, namely, the cultural, the political (institutional), and the spiritual. A common point of these pillars is the focus on human values, which signifies a shift toward a more normative approach rather than basing SD solely on quantifiable indicators of the pre-Rio era. Thus, the authors highlighted the evolved conception of ESD into a lifelong process, i.e., a means to an end (of achieving a better quality of life), rather than an end in itself such as achieving academic or vocational qualifications. Importantly, Leal Filho et al. identify key practical actions to keep up the progress of the DESD, including basic competency development of understanding the complexity of SD, the creation of accessible ESD knowledge-sharing platforms, or the issue of funding for ESD projects and initiatives, etc. To prepare for the next ESD agenda after DESD, Beynaghi et al. (2016) analyzed the results of sustainable development integration at universities and thus predict the orientation they would take in the period after the DESD, which would have been the Global Action Program on Education for Sustainable Development (GAP). The authors found the evolution of the notion of sustainable development and its emergence into a core concern for higher education (HE), moving from being merely a new attitude in the 1970s and 1980s (phase 1), into being embedded into higher education paradigms through official statements and formal initiatives (phase 2), to finally morph into phase 3 (HE for SD), where SD starts to become a major driver of structures and functions of HE. Another significant strength of these articles is that they provided evidence for ESD integration through the case study review approach. To document the efforts universities have made during the DESD, Karatzoglou (2013) systematically reviewed journal articles on ESD in universities, characterizing them into two objectives: articles that used theoretical frameworks to analyze the universities’ engagement on a theoretical normative basis or referencing from published meta-analyses; and articles that presented case studies that are analyzed under such theoretical framework and thus raised commentary on particular aspects of the implementation. The paper pointed out the popular research approach where the engagement of HEIs with sustainability is described in a case study, often in an instructive and resolving light. However, as the case studies varied in backgrounds, orientation, and target objective, such an approach failed at synthesizing a constructive knowledge base of the university-sustainability relationship. As a result, the authors raise these orientations for improving research in the field of ESD: Creation of rigorous conceptual framework and terminology for the field, application of case-study research, and the standardization of the publications that provide generalization and adaptability for the findings in different contexts. This paper succeeded in capturing the characteristics of many casestudy based research that would continue to dominate in publications in the ESD field. Another paper provided a comprehensive case-study analysis in 33 papers, in which the authors discussed findings on the implementation of SD in HEIs, stakeholder and ESD, campus operations, sustainability report and evaluation, changes in curriculum, and examples of ESD approaches. Interestingly, while the paper has no synthesized conclusion, its high citation impact indicated a need for researchers to look at a comprehensive case-study review to gain a reference on the field. 4.3. Authors’ characteristics Top authors Authors Articles GERICKE N 9 LEE JCK 9 KOPNINA H 7 LEAL W 7 SINGER-BRODOWSKI M 7 AZEITEIRO UM 6 EILKS I 6 PAVLOVA M 6 THOMAS I 6 RIECKMANN M 5 BARTH M 4 BROCK A 4 CAEIRO S 4 KNUTSSON B 4 KOLLECK N 4 MACLEAN R 4 OSTMAN L 4 PACE P 4 SPRENGER S 4 SUND P 4 Table 4. Authors with most publications in the ESD research landscape Figure 7. Top authors’ production over time Table 4 and figure 7 display the top 20 authors with the highest publication volumes. With 9 publications, GERICKE N and LEE JCK are the most productive authors in this field. An interesting feature of the publication period is that multiple authors tend to publish the majority of their papers in the same year, notably LEE JCK with 7 articles in 2009, THOMAS I with 5 articles in 2015, and CAEIRO S with 3 papers in 2005. Of course, there are exceptions such as SINGERBRODOWSKI M and AZEITEIRO UMO with publications spreading over the years. Overall, there are not many differences between the top 20 authors in terms of cumulative numbers of publications. Top authors by h-index Figure 8. Author’s local impact by h-index The h-index is a tool for assessing the cumulative influence of an author's scholarly output and performance; it compares publications to citations to determine quantity and quality (Bornmann & Daniel, 2007). GERICKE N was also the author with the highest h-index. His works examined perception of sustainability in both students and teachers and highlighted the concept of sustainability consciousness. The following authors with highest h-index were KOPNINA H, LEAL W, and SINGER-BRODOWSKI M. Kopnina provided a critical view by criticizing and evaluating the current ESD discourse, arguing that the current concepts of sustainable development neglected ecological justices for non-human elements while LEAL W covered broad analysis on ESD agenda, namely reflection on the DESDs, SDGs, and the contents of ESD itself for 2030 sustainable development agenda. Country scientific production Table 5 shows the total number of publications by authors’ country, showcasing the top 20 countries Region Number UK 135 GERMANY 126 CHINA 87 SPAIN 87 SWEDEN 78 USA 78 AUSTRALIA 69 PORTUGAL 63 JAPAN 45 CANADA 40 BRAZIL 29 RUSSIA 29 MALAYSIA 26 SOUTH AFRICA 26 AUSTRIA 23 SWITZERLAND 23 BELGIUM 22 SOUTH KOREA 21 UKRAINE 21 NEW ZEALAND 19 Table 5. Total number of ESD publications by country Figure 9 visualizes the regions with the most authors publishing in the ESD research landscape. Darker regions represent higher publication numbers, while grey regions represent no authors in the field. Overall, Europe, North America, and Oceania are the three regions with dominant scientific outputs. The publications from Asia are mostly concentrated in Japan, China, Korea, and Russia. In terms of ranking in volume, Europe is dominating the field, holding 9 positions over the top 20 countries and more than half of the publication output. Europe also accounts for three of the top 5 countries with the highest scientific output. Figure 9. Map of ESD publication by region Collaboration network Country Articles Single- Multiple- Percentage country country of multiple- publications Publications country publications NETHERLANDS 12 7 5 41.67% NORWAY 8 5 3 37.50% CHINA 34 22 12 35.29% MALAYSIA 9 6 3 33.33% GERMANY 67 46 21 31.34% AUSTRIA 10 7 3 30.00% USA 28 20 8 28.57% KOREA 11 8 3 27.27% UNITED 60 44 16 26.67% KINGDOM AUSTRALIA 38 29 9 23.68% JAPAN 20 16 4 20.00% ROMANIA 10 8 2 20.00% BRAZIL 16 13 3 18.75% PORTUGAL 16 13 3 18.75% CANADA 19 16 3 15.79% SWEDEN 40 35 5 12.50% SPAIN 34 30 4 11.76% TURKEY 9 8 1 11.11% SOUTH AFRICA 12 11 1 8.33% UKRAINE 8 8 0 0.00% Table 6. Publications by single-country and multiple-country collaboration Table 6 represents the collaboration of authors in the top 20 countries with the most publications, distinguished by their corresponding authors’ countries and publication volumes. In addition, single-country publications (SCP) and multiple-country publications (MCP) are also categorized. In terms of international collaboration, Netherlands and Norway have the highest rate of multiple-country publications at 41.67% and 37.5% while Germany and England have the highest numbers of multiple-country publications at 21 and 16 articles respectively. This means that Dutch and Norwegian authors collaborate with the most international researchers qualitatively, whereas German and English authors have the highest number of publications with international collaborators. In contrast, Ukraine has the lowest rate and number of multiple-country publications at 0 percent, meaning their works are entirely written by domestic researchers. The network of collaboration is visualized in figure 10. Figure 10. Collaboration network of countries 4.4. Structure review Cooccurrence map Figure 11. Co-occurrence map of keyword plus in ESD research landscape As supported by bibliometrix r package, the occurrence map is based upon the keyword plus of articles in the ESD research landscape. This is a powerful bibliometric index for content analysis as it provides insights into the field’s structure (Zhang et al., 2015). As in figure 9, keywords are represented by nodes, connected through strings, and clustered into different groups of colors. The sizes of the nodes indicate their frequency, while the strings indicate that the keywords have appeared altogether in at least one article. The clusters are distinguished through the Louvain method for communities, grouping items with similar centrality and density characteristics (Aria & Cuccurullo, 2017). A node's centrality is determined by how frequently it is found on the shortest path between other nodes, indicating its significance in the network while the quantity of connections a node has is measured by its density. Centrality and density will be utilized in the later parts to discuss thematic topics of the ESD research landscape. The biggest two groups consist of red nodes and blue nodes’ communities. Red nodes’ community centers around “knowledge”, “students”, “attitudes”, and “environmental education” while blue nodes’ community centers around “competencies”, “framework”, “university”, “science”, and “management”. These translate into two approaches to ESD research: one emphasizes ESD as environment-oriented pedagogy and seeks to understand the attitude and behavior of students with regard to ESD, whereas the other focuses on developing theories and frameworks to competence learning as a tool to integrate ESD. In addition to the main nodes, small nodes offer perspectives on the topics of those approaches. In the red nodes, a series of psychological keywords (“beliefs”, “behaviors”, “perceptions”, “values”) are interconnected, while the blue nodes contain essential keywords for ESD research, notably “challenges”, “barriers”, “curriculum”, “university”, “strategies”, “implementation”, and “integration”. Thematic map Figure 12. Thematic map of ESD research landscape Another function of bibliometrix r package allows us to map out major themes of the research landscape (Cahlik, 2000), constructed as follows: Niche themes: The up-left quadrant, with low centrality and high density, represents welldeveloped but marginal themes of the field. Motor themes: The up-right quadrant, with high centrality and high density, represents well-developed and critical themes for the overall development of the field. Emerging or declining themes: The lower-left quadrant, with low centrality and low density, represents weakly developed and marginal themes. Basic themes: The lower-right quadrant, with high centrality and low density, represents multidiscipline themes that are important for certain research areas of the overall field. Basic and motor themes are similar to the findings of the co-occurrence maps, highlighting topics that are well established in the fields. The following discussion will provide a comprehensive review of each theme group. 5. Discussion Motor theme: Students’ attitude and perception of ESD The motor themes are characterized by their high density and high centrality. Here, we found study on the attitudes of students on various aspects of ESD is one of the motor themes. Specifically, there seems to be a general positive perception among the students, regardless of their majors, toward sustainable development, yet many of them feel educational institutions need to do more in terms of pedagogy and outreach to make the concept more concrete and relatable to their specific field of study. Research studies in the motor themes also found various socio-demographic determinants of attitude toward ESD such as age and gender. These results provide actionable insights for the design and delivering of educational program to promote sustainability as a mindset for the students (Vuong, 2020, 2021). For instance, Zeegers and Clark (2014) looked into the sustainability awareness of 35 master's students in environmental studies by examining their changes in perception after a seminar course in sustainability. As a result, the students, who started the course with an environmentalcentric view of sustainability, ended the course with similar perspectives despite undergoing an interdisciplinary pedagogical approach to sustainability, in which economic, social, and environmental factors were integrated. Another study by Aleixo et al. (2021) presented a comprehensive analysis of Portugal students’ perception of sustainable development at the national scale, surveying 1257 students on habits, behaviors, experiences, and knowledge of SDGs with regards to sustainable development in their future career. In the findings, there were multiple contradictions. While a large proportion of students had heard of the SDGs and recognized their significance, many believed that higher education institutions can conduct more activities to promote SDGs. In addition, although the issue of climate change was well aware among students, very few of them had participated in extracurricular activities for sustainable development, notably environmental or community volunteering. On categorizing students’ level of SDGs’ perception and practices, the biggest 45% group of students had concerns regarding climate change and were active in pro-environmental practices while the smallest 8% were questioning climate change and thus less involved in such practices. The cross-disciplinary approach with ESD as an integration element is also a popular subject for many studies. Sharma and Kelly (2014) assessed business and accounting students’ attitudes toward ESD through a data survey of 60 students and further interviews with 20 students among the group. The study found that the majority of the participants had a positive perception of the ESD and sustainable business practices in their curriculum, and they were confident in their level of sustainability knowledge. Tunji-Olayeni et al. (2020) studied the sustainability knowledge of construction students namely “sustainable construction”. Through the survey and statistical analysis approach, the study identified that while the concept was not well perceived among students, they believed the concept can have great applications and were positive to learn more about it. In addition, students associated sustainable construction with three main fields: renewable energy, energy efficiency, and waste reduction. Angiel and Pokojski (2019) reviewed how ESD was integrated into geography education by analyzing attitudes toward ESD of geography learners at three levels: geography teachers, postgraduate graduates who are preparing to teach geography, and undergraduates majoring in geography. First, most geography teachers (97%) were willing to use the concepts of sustainable development in geographical education despite the fact that they acquired this knowledge only after graduating during additional courses and training. These teachers had a broad understanding of sustainable development and lived by its principles. Secondly, teachers of other disciplines who planned to teach geography nonetheless didn’t adhere to sustainable development principles or ESD in their classrooms even if they had postgraduatelevel knowledge. Finally, even though sustainable development and ESD information were included in academic classes, only half of undergraduate students followed the concepts of sustainable development. Specially, we indicated a study on the interdiscipline approach to ESD by Annan-Diab and Molinari (2017) among the top cited publications, which is also the most recent paper in this category. The study drawed on the Principles for Responsible Management Education (PRME) and interdisciplinary education with sustainability and corporate social responsibility (CSR) at its core. The principles of PRME, namely purpose, value, method, research, partnership, and dialogue, are used to design the postgraduate MBA courses In addition to studies targeting students’ attitudes toward ESD directly, there are research papers on the factors that might positively influence ESD attitudes. A paper by Olsson and Gericke (2016) showed that there was a clear surge in students’ awareness and interest in sustainable development when students went through adolescence period. The study was conducted by surveying 2413 Swedish students in sixth, ninth, and twelfth grades with an age-based questionnaire. Also considering age as a factor, Michalos et al. (2011) hypothesized the predicting variables of ESD perception, namely age, levels of education, attitude, and knowledge, through which they sought to determine the most influential variable on behaviors for sustainable development. To confirm their hypotheses, they surveyed 506 adults and 294 students from grade 6 to grade 12 in Canada on the knowledge, attitudes, and behaviors of the UN decade’s basic themes. They found that attitude toward sustainable development had a relatively stronger influence over pro-sustainability behaviors than age, levels of education, and knowledge. There were striking differences between the adults and the students: while gender was the strongest predicting variable of behaviors for sustainable development among the students, while having a positive attitude toward sustainable development was the strongest predicting variable for the adults. Furthermore, whereas knowledge was as influential as attitudes for the student sample, attitudes were significantly more influential than education for the adult samples. In addition, while perception is one of the keywords associated with the niche themes, it is widely used in the abstracts of papers belonging to the motor themes. This implied that when authors select a keyword to represent their study, “attitude” and “student” are more preferably selected together than “perception”. Research in the motor theme reflected the learning aspects of the ESD for 2030 agenda, with strong emphasis on cross-discriplinary and interdisciplinary to to advance students’ understanding of sustainability in diverse context. Basic theme: ESD in higher education and competency-based learning The basic themes are characterized by their low density but high centrality, meaning they are important parts of the literature, but the issues have been well-researched. ESD at the level of higher education is one of the main research topics in the basic themes. Research on ESD at the higher education level addressed the issue of monodisciplinary in university’s curriculum structure and offered interdisciplinary approaches that have renovated their universities’ methods of pedagogy (Cotton et al., 2009; Grierson & Munro, 2018; Rouhiainen & Vuorisalo, 2019; Zhang, 2013). In the case study of UK and China universities (Zhang, 2013), differences between the education system of a developed country and a developing country raised different interpretations of interdisciplinary ESD. Whereas in England, learning through extra-curriculum and projectoriented activities had been implemented as interactive methods to increase learning engagement of ESD, the changes in China required fundamental curriculum to adjust as to open to the activelearning characteristic of ESD. Examining another case, the curricula were intercrossed between architecture and engineering with learning principles grounded in sustainability in the University of Strathclyde Glasgow’s postgraduate program in the United Kingdom (Grierson & Munro, 2018). The interdisciplinary character of the course proved a success after evaluation, with effective learning methods and well-perceived by students who participated in it. The involvement of stakeholders is another critical element to integrate ESD into higher education (Farinha et al., 2017; Pellicer Sifres et al., 2016; Vargas et al., 2019). The level of stakeholder can be internal as student and staff’s actions to promote ESD (Barth & Rieckmann, 2012; Novawan & Aisyiyah, 2020; Sivapalan, 2016) or external as governmental roles in regulating educational policies (Banga Chhokar, 2010; Nomura & Abe, 2010). In strengthening stakeholders’ engagements, Pellicer Sifres et al. (2016) emphasized the participatory character of the activities. Activities to promote ESD to the public, notably research, teaching, awarenessraising, and policy advocacy would have meaningful impacts once stakeholders participating are diverse (university and citizenry). A large proportion of papers in this field examined ESD integration in traditional competency-based education, making it a topic in the basic themes as well. As competency-based education is grounded on an outcome-based approach to education, which is measured by knowledge, attitudes, values, skills, and behaviors, the inherent nature of ESD is a hard-to-quantify variable. What competencies are indicators of success in ESD integration? While core competencies for ESD have been theories by many authors in the fields, they usually emphasize the essentiality of sustainable development knowledge (Hudima & Malolitneva, 2020). In other words, the established sets of competencies for ESD lacked the attitudes, values, and skills that enable a learner to contribute to sustainable development goals. For instance, Faham et al. (2017) defined ESD competencies for students and graduates in eight variables: understanding of sustainability, multidisciplinary collaboration, critical and creative thinking about sustainability, systemic thinking about sustainability, commitment to sustainability, and respect for past, present, and future generations. Sánchez-Carracedo et al. (2022) used the learning competencies of students from different grades and majors to measure the quality and quantity of sustainability knowledge that they have acquired throughout the ESD-integrated curriculum and to compare ESD perceptions among education degrees and engineering degrees. Although the association of ESD knowledge to success in fostering ESD competencies is understandable, by doing so, ESD competencies might not correlate with other necessary competencies that are desirable by traditional education standards. This aspect is partly mentioned in the most cited article in this field, The integration of competencies for sustainable development in higher education: an analysis of bachelor programs in management (Lambrechts et al., 2013). The study’s methodology was to assess whether competencies for sustainable development were integrated into the key competencies achieved at the university. For context, the study was conducted in universities where sustainability was integrated at the core of the curriculum. Competencies for sustainable development included responsibility, emotional intelligence, system orientation, future orientation, personal involvement, and action skills, none of which are based on sustainability knowledge. As a result, the integration of those competencies was found to be insufficient, implicit, and fragmented. Thus, competencies for ESD that are not based on sustainability knowledge can be a branch of studies in the future as it has the potential to combine traditional pedagogical planning with the interdisciplinary nature of sustainability studies. Niche themes: Cases of successful ESD integration The niche themes are characterized by the high density but low centrality, which means, papers on these themes have high connections among each other but they have not had the impacts needed to be considered central themes. Our data show the niche theme for ESD research is successful cases of ESD integration. To illustrate, analyzing how ESD was introduced into Egyptian schools, Sewilam et al. (2015) presented the European-Egyptian project “EduCamp” that incorporated main sustainability development principles into the education system of Egypt. The project was based on the following foundations: modifying pedagogical techniques, teaching the teachers, raising public awareness of sustainability, and practicing a cooperative approach amongst various stakeholders. As a result, ESD teaching kits were formed, which covered interactive learning activities on the themes of biodiversity, agriculture, energy, and water. The kits were of course covered in the teachers’ training programs. Furthermore, centers of excellence on ESD were established to guide the integration process and support teachers’ training. In the university curriculum, Hoveskog et al. (2018) presented an undergraduate course “Experimental Workshop”, in which the service-learning pedagogic approach reflected by the combination of learning activities and community engagement was integrated. The purpose of the course was for business students to come up with innovative business solutions for biogas production in cooperation with farmers in southern Sweden. Through the course, the students had the chance to utilize their theoretical knowledge while creating practical values for the community and being in accordance with the models of sustainable business practices. In another case, Gómez Zermeño and Alemán de la Garza (2021) described the formation of an open laboratory of social innovation that connects the university to the public. In detail, 67 participants were contributing to the lab, sharing their perspectives on raised social issues on the platform, and proposing solutions to such problems. The participants came from multiple levels of university stakeholders, notably university students, civil organizations, government officials, and university professors. The platform acted as a connection between multiple stakeholder groups, namely academia, business, and government, to work together on developing solution for community’s social issues, thus collectively encourage social innovation with active engagement from multiple parties. The element of interactive learning is crucial to help students accept ESD integration as discussed in the section on ESD in higher education(Howell, 2021; Martínez Casanovas et al., 2022; Zhang, 2013). One of the good methods to appeal to young learners is through a videogame, as in the case of Ocean Limited (Koenigstein et al., 2020)- a game designed to promote players’ understanding of marine sustainability. In the game, Ocean Limited offered a thorough socialecological integration of global ocean systems, marine sustainability issues, and climate change consequences by letting players choose their roles and actions as ocean stakeholders. Thus, the players could develop ocean agreements and collaboration focused on sustainability, systemic thinking, and empathy for other actors in the marine settings. As these examples have illustrated, cases of successful ESD integration varies in their characteristics, yet there seems to be an overarching theme of participatory design and innovativeness. In other words, for new ESD programs to be well-received, they tend to require active participation from the students rather than being passive receiver of information in a traditional pedagogical approach. In addition, innovative methods to engage the learners with concepts and wide-range perspectives in ESD are encouraged as new studies on the use of game in promoting eco-friendly awareness have shown promising results (Ho et al., 2022a, 2022b; Koenigstein et al., 2020). Emerging or declining themes: Policy influence on ESD Research papers on the topic of ESD policies belong to the emerging/ declining themes, characterized by their low centrality and low density of the key words. In other words, research on impacts of policy on ESD remains scattered, country-specific, and lack of generalizability. For instance, the Japanese government was very supportive of the ESD agenda, and their policies deliberately pushed for ESD integration in the educational system (Nomura & Abe, 2010). However, these initiatives unintentionally create a dependency among the higher education institutions, who have relied increasingly on the supports of the Japanese education ministry. Thus, leadership development at individual higher education institutions was critical for the long-term integration of ESD in Japan's education system. Unlike the Japanese situation, for Taiwan, ESD integration had become a form of symbolism, serving bureaucratic functions rather than being practical (Huang et al., 2021) as the country promoted the ESD content while not addressing ongoing unsustainable development issues. In China, policies on rural education were irrational and its emphasis on care for rural areas was insufficient, leading to the education system itself being poorly operated, and a lack of resources for rural teachers (Xue et al., 2021). The remaining papers on this topic had vastly distinctive objectives and outcomes, examining specific characteristics of policy research in relation to ESD (Bengtsson, 2016; Huckle, 2008; Michalos et al., 2011). Consequently, future studies can build on this existing literature by identifying general themes and research problems that can be studied across regions and countries. Furthermore, studies that compare policy direction among different countries can have a huge impact in filling the gap in the literature and also stimulating much needed policy dialogues among the nations and international educators. 6. Limitation and conclusion There are several limitations to the study. First, as only journal articles are selected, there are potential gaps in knowledge of the field from other document types, such as books, conference proceedings, or government documents. Secondly, we noticed a small proportion of the paper that interpreted the meaning of ESD differently from its definition but have “education in sustainable development” in their titles. Such papers are not included in the comprehensive review section but might influence some results from the bibliometric review section. Finally, there might be missing ESD research papers from our method of keyword search. Papers that do not deliberately emphasize ESD elements in the title would not be collected. In this study, we have provided a bibliometric and comprehensive review of the education for sustainable development research landscape through a dataset of 632 journal articles. The scientific productivity and citation metrics showed that this field is still developing and having a medium impact. There are four foundation journals both for publishing and referencing, namely Sustainability, Environmental Education Research, International Journal of Sustainability in Higher Education, and Journal of Cleaner Production. On the global scale, Western Europe is the most developed area for ESD studies, although we can see diverse collaboration among Europe and North America, Asia, and Australia. In addition, the list of top-cited publications is a good place for readers who wish to study the most impactful papers in the ESD field. The co-occurrence map and thematic map offer insights into the structure of ESD research. Based on such insights, we constructed reviews on students’ attitudes and perceptions toward ESD, ESD in higher education, and competency-based education, cases of successful ESD integration, and policy influence on ESD. 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