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    Analysis of the studies made in the field of green supply chain management by bibliometric method
    (Keai Publishing Ltd, 2024) Deste, Mustafa; Yildirim, Turgay; Yurttas, Aziz
    In this study, the studies conducted in the field of Green Supply Chains(GSC) between 2010 and 2022 in the Web of Science database were analyzed using the bibliometric method. For this purpose, 1.544 article types of 13 years between the mentioned years were obtained in the Web of Sciencedatabase. The obtained data were analyzed with the R-Studio biblioshinyprogram. In addition, the VOSviewer program was used to visualize the data. With the bibliometric analysis method, the countries with the most publications, the most cited authors, the most cited publications, and the authors with the most publications are shown. In addition to these, the most published journals, the keywords used in the publications, the publication rate by country, the citations received by years and finally the publications made according to the years were examined. As a result of the analysis, it has been understood that the popular and respected position of the Green Supply Chainsthemed studies scanned in the Web of Sciencedatabase has increased more. In addition, it has been determined that the annual number of publications has been increasing in the aforementioned theme, and it has been seen that the authors from different parts of the world have started to publish on a wider range of topics with the joint participation of authors.
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    Comparative analysis of Turkey's environmental performance with Eastern European countries according to international EPI 2022 data
    (Keai Publishing Ltd, 2025) Karahan, Mehmet; Yildirim, Zafer; Yildirim, Turgay
    In order to effectively address environmental issues, it is important for governments to identify the problems causing environmental pollution within their scope and to develop appropriate solution policies. In order to identify environmental problems and develop necessary policies, it is necessary to consider the environmental performance of countries. Therefore, measuring the environmental performance of countries is of great importance. One of the prominent indices in measuring environmental performance today is the Environmental Performance Index (EPI) developed by Yale University. The main purpose of EPI is to quantitatively measure and compare the environmental performances of countries in order to monitor their progress in environmental sustainability. As of 2022, EPI consists of three main criteria: climate change, environmental health, and ecosystem vitality. In this study, Turkey's environmental performance was evaluated using the Entropy-based PROMETHEE method with international EPI 2022 data. Subsequently, the environmental performances of Turkey and other Eastern European countries were compared in terms of criterion superiority to determine their strengths and weaknesses. In this context, various sub-criteria were analyzed under main criteria such as climate change mitigation, air quality, sanitation and drinking water, heavy metals, waste management, biodiversity and habitat, ecosystem services, fisheries, acid rain, agriculture, and water resources. As a result of the analysis conducted as of 2022, it emerged that Turkey generally exhibited weak environmental performance among Eastern European countries and there is a need for improvement in each criterion. Giving priority to criteria such as Climate Change Mitigation, Sanitation and Drinking Water, Biodiversity and Habitat, Fisheries, and Acid Rain, in which Turkey obtained the lowest scores in the ranking, would be a more strategic approach.
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    Measuring environmental performance of turkic republics with multicriteria decision making methods
    (Gazi Univ, 2025) Karahan, Mehmet; Yildirim, Turgay; Yildirim, Zafer
    This study reassesses the environmental performance of the Turkic Republics using the 2024 Environmental Performance Index (EPI) data with Multi-Criteria Decision Making (MCDM) methods. CRITIC, Standard Deviation and MEREC methods are used to determine the criteria weights, followed by TOPSIS, ARAS and CRADIS methods to rank the countries. The results reveal certain deviations from the traditional EPI ranking, indicating that T & uuml;rkiye performed better under the multi-criteria decisionmaking (MCDM) methods. While Kazakhstan and Uzbekistan generally exhibited the strongest overall performance, Azerbaijan and Kyrgyzstan ranked lower. Despite having the lowest performance in the EPI ranking, T & uuml;rkiye secured the top position under the TOPSIS method. The study underscores the necessity for more comprehensive analyses to support countries in enhancing their environmental sustainability policies and highlights the potential significance of regional cooperation. Notably, water resources emerged as one of the most critical determinants of environmental performance. The findings suggest that traditional rankings may have certain limitations, whereas MCDM methods provide a more balanced and holistic framework for decision-making. In this context, it is recommended that regional structures such as the Organization of Turkic States enhance environmental cooperation to make sustainability policies more effective.