Evaluating and Prioritizing the Green Supply Chain Management Practices in Pakistan: Based on Delphi and Fuzzy AHP Approach

Nowadays, green supply chain management (SCM) practices are increasing among firms to adopt green practices and reduce the negative effects of supply chain operations on the environment. Firms such as manufacturing, mining, and agriculture have to improve their capacity in green SCM practices because environmental regulations force them to consider these issues. However, green practices are new and require comprehensive study to determine this problem. This study has taken the case of three garment manufacturing firms for the evaluation of green SCM practices in the context of Pakistan. The green SCM requires multi-dimensional techniques; therefore, fuzzy-based multi-criteria decision analysis approaches must be adopted while assessing green SCM practices of firms. This is because fuzzy-based methods obtain a significant solution for complex, vague, and uncertain multi-attribute problems in fuzzy environment. Therefore, in this study, a hybrid decision model comprised of Delphi, and Fuzzy Analytical Hierarchy Process (AHP) methodologies is proposed for assessing the green SCM practices of firms in terms of green design, green purchasing, green production, green warehousing, green logistics, and reverse logistics. The Fuzzy AHP method results reveal that “green purchasing,” “green design,” and “green production” are ranked the most important green indicators. Further, results reveal the ranking of manufacturing firms (alternatives) in the context of green SCM practices. This study shall help industries to focus on green SCM practices and adopt the green manufacturing process.


Introduction
Nowadays, green SCM has become a very popular practice because of increasing awareness of environmental protection and sustainability. Industries are obliged to take into account green practices to reinforce their green image and for the betterment of the environment [1]. In this context, various firms such as service, manufacturing, agriculture, and mining industries carry out green SCM practices in many countries of the world [2]. The firms are responsible for their practices in preventing hazardous environmental activities such as overflowing waste and raw material extraction from sites; thus, firms should put more environmental standards and regulations on their activities. The main objectives of green SCM are to achieve sustainable development goals by minimizing or eliminating the environmental damages created by supply chain practices. Therefore, green SCM activities make it important and possible for firms to restructure their design, purchase, production, warehousing, and logistics operations. Further, reverse logistics is a key attribute of green SCM in capturing value from used products and materials or to appropriately recycle them [3].
Moreover, despite the popularity and implementation of green SCM practices in many countries, still, there is room to put forward implications in terms of both practical and research [4]. However, several motivations are reported in the previous studies for firms to implement green SCM practices [5,6]. From these previous studies, it has been identified that some firms implement green SCM based on customer satisfaction and expectations, while some firms adopt green practices for fulfilling environmental regulations. The current globalization has forced policymakers to adopt sustainable activities such as environmental, social, and economic dimensions [7]. Therefore, it is important to involve industrial value creation for the sustainable manufacturing process. The various studies have pointed out the importance of the fourth industrial revolution (so-called Industry 4.0) based on sustainability [8][9][10][11][12]. Nowadays, by the adoption of Industry 4.0, firms are liable to incorporate the triple bottom line sustainability issues for sustainable industrial value creation; therefore, in a previous study, the authors recommended several important dimensions along with triple bottom line dimensions for sustainable industrial value creation for industrial Internet of Things [13]. In another study, an assessment of the economic, ecological and social potential for industrial value creation in Industry 4.0 is qualitatively assessed from a macro and micro perspective, and, the study indicates that the industrial value creation has a positive contribution to sustainable development [14].
It is a matter of fact that firms or managers have to assess their green SCM practices and performances. However, in the process and evaluation of green SCM practices, it has always been considered as a major problem for selecting optimal indicators for firms' development and implementation in greener SCM operations. Because the decision problem is often very complex and includes vagueness, this study aims to propose an assessment approach for green SCM practices in the context of manufacturing firms in Pakistan. Therefore, Multi-Criteria Decision Making (MCDM) methods can be considered as very significant in minimizing the problem under fuzzy environment [15][16][17][18]. This study contributes to obtaining the most important green indicators for the evaluation of green SCM practices. Secondly, a decision model is proposed, which uses Delphi and Fuzzy Analytical Hierarchy Process (AHP) methodologies. In fact, the Delphi and AHP methods have been used together in various studies under fuzzy environment [19][20][21]. However, in the present study, a decision model is used in the perspectives of green SCM practices in the context of Pakistan. The analysis of the decision model would help managers and governments to evaluate this decision problem.
The main objective of this study is to develop a comprehensive set of green indicators to assess the SCM practices of firms using the Delphi and Fuzzy AHP method. This study is attempting to investigate green SCM indicators with respect to the manufacturing firms of Pakistan. Moreover, this is the first work to evaluate the green SCM practices using the Fuzzy AHP approach. The Delphi method is employed to determine and refine the most important green indicators based on expert's feedback. Then, the Fuzzy AHP method is used to evaluate and rank the significant green indicators (criteria), sub-indicators (sub-criteria), and manufacturing firms (alternatives) from the perspective of green supply chain practices. Also, these green indicators can be employed as benchmarking tools for analyzing the firms' green SCM activities.
The remaining sections of the study are organized as follows: Section 2 presents the related studies and proposes the green indicators for supply chain operations. Section 3 presents the proposed decision framework for the study. Section 4 clarifies the results and discussion. Finally, Section 5 provides the conclusion and managerial implications.

Related Studies
Green SCM is a growing topic of interest in professional and academic circles, focused on green process enhancement, reverse logistics or waste reduction, increase in the product life cycle quality, and decrease in harmful environmental activities [22]. Green SCM emphasizes green activities, which are thoroughly related to sustainable environmental practices [23]. Meanwhile traditional SCM practices are hazardous to the environment, such as raw material production, distribution, and material waste, which can create a bad impact on the environment and also a source of pollution. Therefore, to protect the environment, it is essential to take into account green practices such as green manufacturing, green packaging, and reverse logistics in overall SCM operations [24]. Various countries have planned to implement the environmental standards and regulations for the industries to protect the environment from unwanted activities. These standards require industries to adopt green and environmentally friendly strategies in the entire SCM activities for sustainable environmental, economic, and social development.
In previous studies, the various green-based SCM activities have been determined with different aims and objectives. The Multi-Criteria Decision Making (MCDM) based approaches are often used to determine the feasible options for implementation of green SCM activities in the firms. MCDM is a branch of operations research methods to support turning the multi-faceted decision-making problem into a tiny problem [25]. Mirko et al. [26] have conducted a literature survey on sustainability engineering issues using MCDM applications from 2008-2018; the findings of the study present that MCDM methods are very suitable in solving sustainability decision problems. MCDM greatly helps in structuring and prioritizing the decision problem; it supports decision-makers to analyze, select, and rank alternatives based on the evaluation of various criteria of the decision problem [27]. This study evaluates the green supply chain management (SCM) practices in the perspectives of Pakistani manufacturing firms.

Application of MCDM Approaches in Green Supply Chain Management Practices
The MCDM approaches are widely suitable and significant in evaluating green SCM decision problems, such as Analytical Hierarchy Process (AHP), Decision Making Trial and Evaluation Laboratory (DEMATEL), Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS), Analytic Hierarchy Process (ANP), Linear Programming, and Fuzzy Programming. These approaches provide direction in shifting toward sustainable and green SCM operations, which helps in making the environmentally sustainable. Table 1 summarizes the MCDM methods used in green SCM practices.
It is identified that there are various studies relating to the adoption of green SCM using MCDM methods. This study contributes further by developing a hybrid decision methodology comprised of a Delphi and Fuzzy AHP to evaluate and rank the green SCM practices in the context of Pakistani manufacturing firms.

Proposed Green Indicators for Supply Chain Practices
This study identifies several important green indicators for implementing green SCM practices. These green indicators are considered as a supporting tool for supply chain activities. In this study, a comprehensive set of literature reviews has been analyzed to identify the important indicators from the perspective of green supply chain practices. Thus, the six green indicators and twenty-two sub-indicators have been identified after a thorough literature review. These green indicators are: green design (G1), green purchasing (G2), green production (G3), green warehousing (G4), green logistics (G5), and reverse Logistics (G6). Table 2 summarizes the green SCM indicators and sub-indicators. Proposing a sustainable development methodology for mining industries The results present that top management commitment, and initial environmental review are the two main criteria for developing a sustainable development framework for industries AHP 2015 [29] Identify and evaluate the critical factors in green SCM practices The findings indicate that environmental policy and top management support for green SCM are both crucial factors in firm involvement, which should be ranked in the highest preference when green SCMS practices are to be adopted. Further, green purchasing is the most important factor in supply chain operations DEMATEL 2015 [30] Investigation of the influential strength of factors on the implementation of green SCM practices in mining sectors The findings present that explore how top management commitment and competitiveness are the two significant drivers according to their influential strength, while employee pressure is the least significant driver DEMATEL 2016 [31] Selecting and analyzing the green suppliers based on green SCM practices in the Brazilian electronics company The findings of the study show that the significant factors are the commitment of senior management to green SCM and product designs that reduce, reuse, and recycle the material Fuzzy TOPSIS 2014 [2] Evaluating the close-loop or open hierarchical structures in green SCM practices The research findings reveal that supplier involvement and process control are the two most important aspects for close-loop hierarchical structure in green SCM Fuzzy ANP 2014 [32] Selection and evaluation of business strategies for green SCM activities in the Taiwanese electronics industry The results identified that green design, green purchasing, and green manufacturing are the key strategies for business functions in green SCM activities ANP 2012 [33] Evaluation of green SCM practices to reduce a firm's pollution and other environmental impacts The findings of the study indicate that green production is key criteria in reducing the firm's pollution, while management support and flexibility of the supplier are considered as second and third most important criteria in transforming the firm into green SCM Fuzzy Programming 2011 [18] Performance evaluation of green supply chain management The study indicates that green design, green logistics, and green transformation are the most significant drivers for evaluating the green SCM activities of the firm Fuzzy DEMATEL, Fuzzy ANP, and Fuzzy TOPSIS 2016 [34] Assessing the green supply chain management practices of an industry The findings of this research show that green purchasing, green design, and green marketing are the most optimal criteria for assessing the performances of firms in transforming green SCM practices Intuitionistic Fuzzy Numbers Model 2018 [35] Factors Affecting Green SCM practices of the Thai Auto Parts Industry The results of the study present that green procurement is the most optimal factor, followed by green transportation, and green manufacturing for implementing green SCM practices Factor Analysis and Multiple Linear Regression Analysis 2016 [36] Symmetry 2019, 11, 1346 5 of 22

Research Methodology
This study uses the Delphi and Fuzzy AHP methods to determine the important indicators and sub-indicators for evaluating the green SCM practices in Pakistan. Firstly, this study assesses inclusive literature to find out the important green indicators and sub-indicators. Then, a Delphi method is employed to finalize the green indicators in the context of Pakistan. Finally, the Fuzzy AHP method is used to determine the weights and ranking of green indicators (main criteria), sub-indicators (sub-criteria), and green activities of three garment manufacturing firms (alternatives) for successful adoption of green SCM practices. Ten experts participated during the Delphi and Fuzzy AHP method; the consulted experts were knowledgeable about green practices in SCM. These experts included three research fellows, three university professors, two stakeholders, and two government institute analysts. Figure 1 presents the research methodology of the present study.

Delphi Method
In this study, a Delphi approach is applied to finalize the green SCM indicators and subindicators for the adoption of green initiatives in the manufacturing firms of Pakistan. The main purpose of the Delphi method is to collect experts' opinions about any decision problem through semi-structured interviews, group discussions, and questionnaires [53]. In this method, the professional and relevant field experience experts share their opinion, ideas, knowledge, and expertise to make mutual understanding regarding the problem [54,55]. There are various steps involved in the Delphi process, which are comprised of: the selection of experts, the first round of questionnaire survey, the second and third round of the survey, and this process is continued or repeated until the experts research mutual consent [56]. This method does not have restrictions on the number of experts for providing feedback to any decision problem. Different studies have proposed different numbers of experts and rules for the validation of the data. However, a minimum of 9 and 18 experts should be involved in the decision-making process of the Delphi method [57]. Therefore, in this study, ten experts were consulted and participated in providing meaningful feedback about the decision problem. The questionnaire survey to these experts was sent through a webmail service, and each of the experts was asked to assign weights in the survey instrument using

Delphi Method
In this study, a Delphi approach is applied to finalize the green SCM indicators and sub-indicators for the adoption of green initiatives in the manufacturing firms of Pakistan. The main purpose of the Delphi method is to collect experts' opinions about any decision problem through semi-structured interviews, group discussions, and questionnaires [53]. In this method, the professional and relevant field experience experts share their opinion, ideas, knowledge, and expertise to make mutual understanding regarding the problem [54,55]. There are various steps involved in the Delphi process, which are comprised of: the selection of experts, the first round of questionnaire survey, the second and third round of the survey, and this process is continued or repeated until the experts research mutual consent [56]. This method does not have restrictions on the number of experts for providing feedback to any decision problem. Different studies have proposed different numbers of experts and rules for the validation of the data. However, a minimum of 9 and 18 experts should be involved in the decision-making process of the Delphi method [57]. Therefore, in this study, ten experts were consulted and participated in providing meaningful feedback about the decision problem. The questionnaire survey to these experts was sent through a webmail service, and each of the experts was asked to assign weights in the survey instrument using a Likert point scale between 1 and 5 (not at all important and extremely important). The survey instrument is attached in the Appendix A.

Fuzzy Analytical Hierarchy Process Method
AHP is a very significant method of MCDM [57]. This method is a four steps hierarchal approach of MCDM, which is used to rank the criteria, sub-criteria, and alternatives according to the particular goal of the decision problem [58]. However, in this study, the Fuzzy based AHP is employed to spoil the decision problem into a very small problem. This is because the fuzzy set theory helps in solving the incomplete information and immeasurable problem under fuzzy environment [59]. The pairwise comparison is then operated in a matrix using TFNs [60], to evaluate and prioritize the green SCM practices in Pakistan. Table 3 presents the TFNs rating scale employed in the present study. Averagely to strongly significant (3,4,5) 5 Strongly significant (4,5,6) 6 Strongly to very strongly significant (5,6,7) 7 Very strongly significant (6,7,8) 8 Very strongly to extremely significant (7,8,9) 9 Extremely significant (9,9,9) Gogus and Boucher [62] proposed an approach to calculate the inconsistency ratio of fuzzy pairwise comparison matrices. The steps of Fuzzy AHP are given below: Step 1: Transform a fuzzy triangular matrix into two independent matrices. At this step, a fuzzy triangular matrix is divided into two matrices, assuming that the triangular fuzzy number is presented as follows.
Then, the first matrix can be created by middle numbers of the fuzzy triangular matrix, that is: The second matrix can be created by the geometric mean of the upper and lower bounds of the fuzzy triangular matrix, that is: Step 2: Calculate the weight vector based on the Saaty method and calculation of lambda max (λmax).
Step 3: Calculate the consistency index (CI) for each matrix; the CI can be computed based on the following equation: Step 4: Calculate the consistency ratio (CR) of the matrices. For CR, the consistency index (CI) of each matrix is divided by its random index (RI).
The matrices are to be considered consistent if the values of CR m and CR g are less than 0.1; however, if the range surpasses 0.1, then it does not provide significant results. Table 4 shows the values of the RI for each matrix of the Gogus and Boucher method.
The accomplishment of the above Fuzzy AHP steps would provide the results of green indicators, sub-indicators, and firms' activities (alternatives) for implementing green SCM in Pakistan.

Results and Discussion
In the study, a hybrid decision framework (i.e., a Delphi and Fuzzy AHP) has been used to analyze actual garment manufacturing firms. In the case study, the firms are required to improve and transform the manufacturing process into green activities to obey the environmental management regulations and SCM. Therefore, to deal with the problem of supplier selection, the firm should adopt green SCM indicators or criteria to follow the environmental regulations. This decision methodology outlines a systematic and feasible approach for managers towards evaluating and ranking six important green indicators for supply chain operations. Initially, the results of the Fuzzy AHP method has been utilized to evaluate six green indicators (criteria), and twenty-two sub-indicators (sub-criteria), and three firms (alternatives) for the adoption of green SCM practices.

Case Information
Due to the increasing prosperity of the garment products and network market, the manufacturing firms are producing at large scale to meet consumer demand [63]. Currently, several firms produce the largest share of professional garment manufacturing products in Pakistan and these firms are also the largest exporters of the country. The firms are continuing to develop next-generation technology (i.e., Industry 4.0) for improving their competitiveness and satisfying customer demand [64,65]. Furthermore, a rapid transforming of garment manufacturing to green SCM activities is occurring, such as product design, production, purchasing etc. The firms are continuing to develop new green technologies and green products to comply with the environmental regulations of the government. Thus, for the firm to sustain in a competitive market, a proper green SCM system is very important.
It is essential to understand the role of green SCM practices for the sustainable manufacturing process in the firms. Therefore, this study develops the firms' green SCM indicators and sub-indicators to transform the firms' activities into green activities. In the study, three garment manufacturing firms were analyzed. The experts identified a systematic procedure for assessing the green SCM practices of the firms. To select the significant firm, this study, therefore implemented the decision methodology, and firms were evaluated with respect to proposed green indicators for SCM operations. The analysis obtained in this study would provide suggestions to the firms, and it would also be very useful for effective and efficient green SCM adoption process.

Results of Fuzzy AHP Method
The Fuzzy AHP approach has been carried out to determine the various green indicators and sub-indicators weights with respect to the decision methodology of the study. Ten experts' opinions were undertaken to analyze the results. Therefore, in this study, the group decision-making approach has been used to obtain the final results of green SCM indicators and sub-indicators in the context of Pakistan. The detailed fuzzy pairwise comparisons matrix of the indicators and sub-indicators with respect to the goal is presented in Appendix B. In the following section, the results of the Fuzzy AHP method have been analyzed. Table 5 presents the weights and ranking of indicators for green SCM practices in Pakistan. The results of the present study show that green purchasing (G2) with a weight of 0.253 is the most important indicator for the sustainable development of green SCM practices in the country. The second-ranked most important indicator was green design (G1) with a weight of 0.228, while other ranks in the following order: green production (G3) with a weight of 0.192, green logistics (G5) with a weight of 0.152, reverse logistics (G6) with a weight of 0.106, and green warehousing (G4) with a weight of 0.069. Finally, this ranking evaluated the importance of each indicator for the sustainable implementation of green SCM practices in Pakistan.  Figure 2 depicts the weights and ranking of sub-indicators with respect to green design (G1). In the classification of sub-indicators, it is identified that eco-design products (G11) with a weight of 0.373 is the most significant sub-indicator for the implementation of green design products in green SCM practices. Reuse and recycle the product (G14) and reduce the consumption of materials (G13) are recognized as second and third important sub-indicators with a weight of 0.288 and 0.228. Meanwhile, reducing the use of hazardous products (G12) is identified as the least important sub-indicator with respect to green design. Finally, for the sustainable development of green SCM practices in Pakistan, it is necessary to determine green design sub-indicators.  Figure 3 depicts the weights and ranking of sub-indicators with respect to green purchasing (G2). The first place in the ranking of the sub-indicators is to select the eco-friendly supplier (G21) with a weight of 0.429 is first ranked sub-criteria for the evaluation of green SCM practices in the country. Meanwhile, pushing suppliers to take eco-friendly actions (G23) and purchase of eco-friendly raw materials (G22) with a weight of 0.356 and 0.215 are considered as second and third important sub-indicator in the perspective of green SCM in Pakistan.  Figure 3 depicts the weights and ranking of sub-indicators with respect to green purchasing (G2). The first place in the ranking of the sub-indicators is to select the eco-friendly supplier (G21) with a weight of 0.429 is first ranked sub-criteria for the evaluation of green SCM practices in the country. Meanwhile, pushing suppliers to take eco-friendly actions (G23) and purchase of ecofriendly raw materials (G22) with a weight of 0.356 and 0.215 are considered as second and third important sub-indicator in the perspective of green SCM in Pakistan.  Figure 4 presents the weights and ranking of sub-indicators with respect to green production (G3). In the ranking of the sub-indicators, cleaner production (G31) is identified as a significant sub-indicator with a weight of 0.411 for the evaluation of green SCM practices in the country. Further, reduce the environmental impact on operations (G33), and lean production (G32) are also best-suited sub-indicators with a weight of 0.328 and 0.183. Reduce the amount of scrap (G34) is determined as the least significant sub-indicator. In the study, all these sub-indicators are crucial for the development of green CSM practices in Pakistan.   Figure 5 presents the weights and ranking of sub-indicators with respect to green warehousing (G4). In the G4 category, eco-packaging (G41) was prioritized as the top-ranked sub-indicator with a weight of 0.373. The following sub-indicators were prioritized: reducing the inventory levels (G43), sale of excess inventories (G42), and sale of scrap materials (G44), respectively. Therefore, the key steps must be taken by managers and governments to analyze the indictors for implementing green SCM practices.  Figure 5 presents the weights and ranking of sub-indicators with respect to green warehousing (G4). In the G4 category, eco-packaging (G41) was prioritized as the top-ranked sub-indicator with a weight of 0.373. The following sub-indicators were prioritized: reducing the inventory levels (G43), sale of excess inventories (G42), and sale of scrap materials (G44), respectively. Therefore, the key steps must be taken by managers and governments to analyze the indictors for implementing green SCM practices.    Figure 7 indicates the weights and ranking of sub-indicators with respect to reverse logistics (G6). Develop an environmental management system (G61) was prioritized as the most influential sub-indicator with a weight of 0.382. The use of alternative energy sources (G62) is ranked as the second important sub-indicator, while recycling end-of-life products (G63), and use of waste of other industries (G64) followed as third and fourth, respectively.  Figure 7 indicates the weights and ranking of sub-indicators with respect to reverse logistics (G6). Develop an environmental management system (G61) was prioritized as the most influential sub-indicator with a weight of 0.382. The use of alternative energy sources (G62) is ranked as the second important sub-indicator, while recycling end-of-life products (G63), and use of waste of other industries (G64) followed as third and fourth, respectively.   Table 6 presents the overall ranking of green sub-indicators with respect to the goal. Overall, twenty-two sub-indicators were analyzed for the evaluation of green SCM practices. The results indicate that "select the eco-friendly supplier (G21)", "pushing supplier to take eco-friendly actions (G23)", and "eco-design products (G11)" are the most significant sub-indicators (sub-criteria), while "sale of excess inventories (G42)", "use of waste of other industries (G64)", and "sale of scrap materials (G44)" are considered as most insignificant sub-indicators for the development and adoption of green SCM practices in Pakistan.

Ranking of Manufacturing Firms (Alternatives)
The above section provides the results of six green indicators and twenty-two sub-indicators, while in this section, the three manufacturing firms (alternatives) results have been analyzed using the Fuzzy AHP method. Figure 8 presents the final ranking order of alternatives with respect to the goal. In the study, the names of the firms are not disclosed due to privacy to the implementation of green SCM activities. Experts' analysis assisted in obtaining consistent and reliable results for the Fuzzy AHP approach. The results indicate that the garment manufacturing firm (F1) is identified as the most significant option for the development of green SCM practices. While F2 is recognized as a second suitable option, while F3 is considered as a third important firm in the adoption of green supply practices in Pakistan. Table 6. The weights and ranking of overall sub-indicators.

G21
Select the eco-friendly supplier 0.1085 1st G23 Pushing supplier to take eco-friendly actions 0.0900 2nd G11 Eco-design products 0.0850 3rd G31 Cleaner production 0.0789 4th G14 Reuse and recycle the product 0.0656 5th G52 Using eco-friendly transportation 0.0633 6th G33 Reduce the environmental impact on operations 0.0629 7th G22 Purchase of eco-friendly raw materials 0.0543 8th G53 Eco-friendly distribution 0.0527 9th G13 Reduce the consumption of materials 0.0519 10th G61 Develop environmental management system 0.0404 11th G51 Reduce fuel consumption 0.0360 12th G62 Use of alternative energy sources 0.0359 13th G32 Lean production 0.0351 14th G41 Eco-packaging 0.0257 15th G12 Reduce the use of hazardous products 0.0250 16th G63 Recycling of end-of-life products 0.0219 17th G43 Reduce the inventory levels 0.0215 18th G34 Reduce the amount of scrap 0.0149 19th G42 Sale of excess inventories 0.0140 20th G64 Use of waste of other industries 0.0076 21st G44 Sale of scrap materials 0.0075 22nd

Discussion
In the study, three garment manufacturing firms of Pakistan were selected as a case study. Each of the firms has been evaluated with proposed green indicators and sub-indicators for implementing sustainable SCM practices. The proposed decision methodology has been successfully applied to this complex decision problem. The results indicated that the manufacturing firm (F1) is the most optimal in performing and implementing green activities in the firm. Additionally, the results of Fuzzy AHP methodology recommended that green indicators revealed that green purchasing (G2) with 0.253 placed in the first priority, green design (G1) with 0.228 in the second place, green production (G3) with 0.192 in the third place, green logistics (G5) with 0.152 in the fourth place, reverse logistics (G6) with 0.106 in the fifth place, and green warehousing (G4) with 0.069 acquired the lowest importance. Further, the five most important green indicators are selecting the eco-friendly supplier, pushing supplier to take eco-friendly actions, eco-design products, cleaner production, and reuse and recycle the product. This is the first study that identifies and assesses the green indicators for supply chain activities

Discussion
In the study, three garment manufacturing firms of Pakistan were selected as a case study. Each of the firms has been evaluated with proposed green indicators and sub-indicators for implementing sustainable SCM practices. The proposed decision methodology has been successfully applied to this complex decision problem. The results indicated that the manufacturing firm (F1) is the most optimal in performing and implementing green activities in the firm. Additionally, the results of Fuzzy AHP methodology recommended that green indicators revealed that green purchasing (G2) with 0.253 placed in the first priority, green design (G1) with 0.228 in the second place, green production (G3) with 0.192 in the third place, green logistics (G5) with 0.152 in the fourth place, reverse logistics (G6) with 0.106 in the fifth place, and green warehousing (G4) with 0.069 acquired the lowest importance. Further, the five most important green indicators are selecting the eco-friendly supplier, pushing supplier to take eco-friendly actions, eco-design products, cleaner production, and reuse and recycle the product. This is the first study that identifies and assesses the green indicators for supply chain activities in Pakistan. However, there are various studies pertaining to the evaluation of green SCM with different aims and objectives. The findings of Wu et al. [30], shows that environmental policy objectives and top-level management support are very important factors for shifting of any firm to sustainable SCM operations, they also indicate that green purchasing is the most important factor in supply management operations. The study by Tseng et al. [32] found that supplier involvement and process control are the two important aspects for determining the close-loop hierarchical structure in green SCM; these findings are very similar to this study in which the selecting eco-friendly supplier is recognized as the most important green sub-indicator for SCM practices The results of the case study are similar to Deng et al. [35], who found that green purchasing and green design are the most important green criteria for evaluating the firm activities toward sustainable SCM. The results of this study are also in line with Korrakot et al. [36], who indicated that green procurement is the most optimal green driver for implementing the green SCM practices. Moreover, the results are partially similar to the study of Chen et al. [33], who investigated the business strategy for green SCM using ANP method and found that green design, green purchasing, and green manufacturing are the significant green strategies for SCM activities. In a broader sense, the decision methodology can be utilized as an analytical approach to propose and select a strategic environmental development plan for green SCM practices of the firms. To obtain significant results, managers should understand the firms' green SCM assessment indicators. In this study, it is identified that none of the previous studies used a Delphi and Fuzzy AHP model to evaluate green indicators and sub-indicators for assessing firms' green SCM practices in the context of Pakistan.
The developed decision methodology is validated through the case study of Pakistan, and the manufacturing companies (alternatives) were assessed in a fuzzy environment considering uncertainty and vagueness of real-life cases. There are various studies, which investigate the green performance of the firms, but, in this study, the Fuzzy AHP methodology is used for assessing and prioritizing the overall green SCM practices of the firms. The assessment procedure enables firms to check their green practices comparing the other firms and to determine useful opinion about the areas of improvement. This study, therefore, would greatly guide managers and governments to initiate green SCM practices in the country.

Conclusions
In this study, green SCM practices have been evaluated from the perspective of Pakistan. The main aim of this study was to develop important indicators to analyze the green SCM practices using the Delphi and Fuzzy AHP methodologies. Thus, this is a very first attempt and research work to evaluate green SCM practices for minimizing the negative impact of supply chain operation on the environment. The industries have to improve their ability to adopt green activities based on environmental regulations and practices. This study contributes to green SCM practices and developed significant indicators based on the literature review. Therefore, the various important and validated indicators were determined for the successful implementation of green SCM in the country. To achieve sustainable development goals, it is necessary for a country to focus on green practices. The various studies have comprehensively discussed the basics of green SCM implementation practices; however, nowadays, this is a very critical topic, and more research work is needed to explore and analyze the development of green SCM practices in Pakistan.
The decision making and evaluation process in real-life is often difficult to understand because the numerous uncertainties and fuzziness exist. This research has developed a systematic decision framework methodology comprises of a Delphi and Fuzzy AHP methods to evaluate the green indicators for handling vague and inconsistent data appropriately. This study has selected three garment manufacturing firms to conduct further research. The Fuzzy AHP results identified that green purchasing (G2), green design (G1), and green production (G3) are the most important indicators for the adoption of green SCM practices in Pakistan. While green logistic (G5), reverse logistics (G6), and green warehousing (G4) are considered as the least important indicators for the development of green SCM. Moreover, the leading sub-indicator in green SCM practices were G21, G23, and G11. Afterwards, the results of the alternatives reveal that F1 is the most optimal manufacturing firm for the sustainable implementation of green SCM practices in Pakistan. The F2 and F3 ranked as second and third important firms in adoption to green practices. This decision-making process would assist managers in analyzing and selecting the optimal firm for green practices in Pakistan.

Managerial Implications
A hybrid decision methodology has been developed to evaluate the green practices with respect to GSM. The firms can derive advantage from the decision methodology developed in the study, which can be employed as a roadmap to a consensus understanding to assess firms' activities in green SCM. Based on the findings of this study, with the green evaluation tool developed, now firms can determine the various ways to enhance green practices and reduce environmental impacts. Thus, managers can develop a resilient relationship with their partners, depending on their strengths and take necessary actions to overcome the weaknesses. The digitalization of the firms can be possible by adopting Industry 4.0 approaches and sustainability-related issues for systematically analyzing the decision problem. Moreover, the results of the study can also assist managers in selecting the finest green SCM partner for future cooperation and collaboration. Therefore, the results of the study are very significant for implementing the developed decision framework in green production practices.

Limitations and Future Research Work
This research has several key limitations. For instance, the managers of the firms did not participate in the study due to difficulties in approaching and accessing them. Therefore, in future research, top-level managers can be employed in the decision-making process, which shall improve the consistency and robustness of the proposed research framework. Another limitation is that this study used Fuzzy AHP method; however, it is also essential to use other MCDM techniques such as ANP, DEA, VIKOR, DEMATEL, and ELECTRE to compare the results of the proposed framework and also analyze the decision problem as a case studies on supply chain practices. This is an outline for future research. This study provides a base for proposing green indicators and implementing green SCM activities in the context of Pakistani firms. Additionally, in future research, the horizontal integration of supply chain management practices should be undertaken with Industry 4.0 and environmental sustainability-related issues to analyze the decision problem more comprehensively.

Conflicts of Interest:
The authors declare no conflict of interest.

Green design (G1)
Eco-design products (G11) Reduce the use of hazardous products (G12) Reduce the consumption of materials (G13) Reuse and recycle the product (G14)

Sale of excess inventories (G42)
Reduce the inventory levels (G43) Sale of scrap materials (G44)

Reverse logistics (G6)
Develop environmental management system (G61) Use of alternative energy sources (G62) Recycling of end-of-life products (G63) Use of waste of other industries (G64) Table A3. Additional green SCM indicators relating to the problem mentioned above, if any.