In 1972, concerns raised in the Club of Rome report regarding the impact of human activities on the world’s ecosystems began to attract greater attention
[14]. As organizations such as companies and universities bear some of the responsibility for severe environmental degradation
[15][16], these entities must participate actively in the effort to save the endangered planet
[17]. Education is also an important tool for guiding society toward sustainability when prevailing approaches to economic growth are not sustainable
[18]. A further link between sustainability and education is the need to ensure that training courses and programs meet labor market needs in this regard
[19]. Throughout history, institutions of higher education have played a significant role in both establishing and challenging societal norms, as well as preparing upcoming individuals in positions of authority, innovation, and influence
[20]. In this way, universities make significant social, economic, academic, scientific, and technological contributions to their local and national environments as the foremost producers of knowledge, which is considered a key driver of economic growth
[21]. This mission requires universities to take the lead in pursuing sustainability
[4], both in their internal affairs (organizational goals, education, research, management) and in their dealings with external stakeholders (within the context of their regional mission)
[22]. As organizations, universities contribute significantly to the personal identity, worldview, and values of their students. Through appropriate curricula and lesson plans, universities can shape their students’ commitment to sustainability and set an example for other institutions, informing future transformation and the creation of a more sustainable society
[23]. Universities have a significant impact on future leaders, teachers, and parents, not only directly through education, research, and knowledge transfer but also through the example they set in being accountable for sustainability performance. Universities that take these responsibilities seriously are expected to be leaders in sustainability reporting practices
[24]. Rooted in the late nineteenth century, the Sustainability in Higher Education (SHE) initiative emerged following the Stockholm Declaration of 1972. In 1990, more than 350 universities worldwide signed the Talloires Declaration, which included “a ten-point action plan to integrate sustainability and environmental literacy in university teaching, research, operations and outreach”. In the last half-century, more than 30 PDS declarations have been signed by more than 1400 universities across the world, affirming the incorporation of sustainability principles into education and research policies
[25], and reflecting the issue’s increasing importance for higher education. In so doing, leading higher education institutions now acknowledge the links between sustainable development and environmental protection, social justice, economic development, governance policies, and student learning experiences, as well as innovation and competitiveness
[26]. University policymakers and planners have increasingly prioritized campus sustainability as a key issue in response to the environmental effects of university activities and operations. The matter has garnered increased impetus due to the influence of state agencies responsible for environmental protection, movements promoting sustainability, university stakeholders, non-governmental organizations, and student advocates
[27]. Because a significant proportion of university facilities are situated in historic buildings, it can be difficult to reduce energy costs. Over the last two decades, as university missions began to incorporate a sustainable development component, many such buildings have been adapted or repurposed. Other elements of university sustainability strategies include data reporting, relevant programs and events, changing curricula, and new research programs. The primary approaches towards sustainability pertain to three key areas, infrastructure, community, and learning. Infrastructure encompasses buildings, morphology, design, energy, food, materials, and waste management. Community pertains to governance, leadership, mission, investments, capital, health, wellness, and services. Learning encompasses curriculum planning and related aspects
[28]. As a result of this growing awareness, universities now play a key role in environmental sustainability through research, updated curricula, and a more environmentally friendly campus infrastructure
[29]. The role of universities in promoting sustainable development has been demonstrated in many academic studies
[30][31][32][33][34][35]. Because of their size and the impact of campus activities on the environment and society at large, universities are often referred to as “small cities” in the context of sustainability. Universities are also seen to have the capacity to anticipate change and to be proactive
[36]. The issues of energy use and waste generation are highlighted by the large population of associate, undergraduate, and graduate students at universities in this country, including Bursa Uludağ University (67,173), Marmara University (66,747), Akdeniz University (64,037), Selçuk University (63,221), Ankara University (61,318), Dokuz Eylül University (61,073), Kocaeli University (60,777), Istanbul University (59,900), Atatürk University (58,122), and Ege University (55,158). These numbers refer only to those in face-to-face education and do not include distance and open learning students; according to YÖK statistics, the total number of students in formal education in Turkey is 3,752,475
[37]. When teaching staff and other personnel are also included, some universities can be likened to small cities and should be managed accordingly. To be recognized as a sustainability-oriented institution, a university must address the challenge of holistically integrating the social, environmental, and economic dimensions of organizational operations and structures, as well as education delivery, research, and outreach. For that reason, fragmented initiatives involving a few departments or faculties will not suffice, and sustainability must be addressed at all institutional levels
[38]. Sustainability reporting is recognized as a useful tool for improving universities’ accountability and socio-environmental performance, and more should be done to assist universities to cope with twenty-first century problems that include environmental and socioeconomic disasters, pay disparities across nations, and political instability. To that end, universities must incorporate the concept of sustainable development into future organizational arrangements, research, and education by equipping professionals with the necessary knowledge, competences, and skills to resolve ecological, social, and economic challenges across communities
[39].
In recent years, economic globalization has had a significant impact on communities and organizations, and growing international competitiveness and social scrutiny have also impacted higher education institutions. In this context, stakeholders need more information to evaluate and compare universities’ performance worldwide, and university rankings are widely used for simple and rapid comparison based on a selected set of characteristics
[40] ranging from research and academic reputation to education and environmental performance. Of these three perspectives, most designers of university rankings generally prioritize research and academic reputation, followed by education-related indicators. Institutions and stakeholders are therefore increasingly concerned with university rankings, which impact global, regional, and national rankings, enabling comparisons, and influencing their environments and institutions
[41][42]. Although these ranking tables have been in use for at least forty years, environmental issues have only recently been included
[43]. Since 1983, when US News and World magazine published its first annual review of America’s best colleges, professional organizations and governments as well as private media organizations now produce higher education rankings
[32]. Each stakeholder makes use of these rankings for their own purposes. Prospective students and their families use rankings to select a college based on education quality, future career prospects, and cost; academics use rankings to advance their own career goals; and policymakers and university administrators use rankings to assess their institution’s current status, both nationally and internationally. Finally, these rankings also attract media attention, reflecting the growing societal interest in higher education. Media institutions use university rankings to inform the public about the status of higher education institutions both at home and across the world
[44]. Hazelkorn et al.
[45] found empirical support for the claim that performance indicators have a strong influence on university rankings. A survey of 171 managers from 39 countries found that 87% of respondents closely monitored their ranking and that 61% set ranking targets. Across a range of metrics, global rankings compare institutions, fields, subjects, and scientists around the globe. These metrics are based mostly on bibliometric measures from databases that include Web of Science, Scopus, and Google Scholar. While the Academic Ranking of World Universities (ARWU) prioritizes academic accomplishment, the Quacquarelli Symonds World University Rankings (QS) and the Times Higher Education World University Rankings emphasize reputation and internationalization. Both University Rankings by Academic Performance (URAP) and the National Taiwan University (NTU) Rankings focus exclusively on scientific research performance. US News & World Report’s (USNWR) Top Global University Rankings emphasize academic research and overall recognition
[46]. By aligning sustainability practices with institutional goals, sustainability-related university rankings can help university administrators focus on sustainable development actions. The traditional emphasis on education and research typically excludes social and environmental issues
[38]. However, since 2000, university sustainability assessment tools created by external organizations have become more central than campus environmental audits and other assessments previously performed by students. These new tools commonly facilitate comparison of different universities in terms of their sustainability practices, and this increased visibility incentivizes such practices and shifts the emphasis to off-campus and out-of-classroom indicators. The use of standardized frameworks to assess sustainability encourages universities to collect and report relevant data
[47]. In 2010, the University of Indonesia created the UI GreenMetric system to address campus sustainability issues. Using this approach, higher education institutions around the world are now ranked according to their implementation of campus sustainability measures. Their performance is measured against well-defined and globally accepted indicators in six broad categories
[48]. Based on dimensions of environment, economy, and equity, 95 universities from 35 countries participated in the ranking in 2010; by 2021, the number of participants had risen to 956 universities from 80 countries.