A Fuzzy Multi-Criteria Analysis of Barriers and Policy Strategies for Small and Medium Enterprises to Adopt Green Innovation

: Recently, small and medium enterprises (SMEs) are increasingly focusing on the implementation of green innovation, mainly due to customers’ increasing environmental consciousness. However, SMEs have not yet achieved any significant accomplishment. The lack of success in implementing green practices is due to various barriers. So, it is crucial to analyze and address these barriers prior to introducing green initiatives. This study prioritizes barriers and solutions to adopt green practices in the context of SMEs in Saudi Arabia. The study develops an integrated decision framework based on symmetry principles to identify main-barriers, sub-barriers, and strategies to overcome these barriers. Six main barriers, 24 sub-barriers, and 10 strategic solutions were identified through literature survey. Then, fuzzy analytical hierarchy process (FAHP) was employed to evaluate main-barriers and sub-barriers. Later, fuzzy technique for order of preference by similarity to ideal solution (FTOPSIS) methodology was used to rank strategies. Results of FAHP revealed that the political barrier category holds higher importance than other barriers. Results of FTOPSIS showed that the strategic solution ‘developing research practices to carryout green innovation in SMEs’ is more important in addressing green innovation barriers in SMEs.


Introduction
Nowadays, customers have become more cognizant of environmental protection than ever [1]. Also, governments are introducing stringent environmental policies to limit pollution caused by industries, including small and medium enterprises (SMEs) [2]. These industries, irrespective of their small or medium sizes, are essential for economic growth and also responsible for environmental degradation. However, due to the small size of SMEs, their contributions to environmental degradation go unnoticed at both national and regional levels. Studies have claimed that SMEs account for nearly 70% of total industrial environmental pollution and waste. Subsequently, the increased awareness of customers and pressure from stakeholders and the governments have increased SMEs' responsibility to minimize environmental impacts caused by their economic activities [3].
Several international level conventions urge SMEs to reduce environmental pollution to protect environmental resources and mitigate climate change challenges. Most of the countries pledged at the Paris 2015 Accord that they shall strictly adhere to the Accord's objective of minimizing greenhouse gas emissions to protect the environment [4]. As we earlier mentioned, SMEs are one of the largest contributors to greenhouse gas emission; however, due to limited resources, SMEs are unable to come up with the expected level of participation. Therefore, policymakers and governments are focusing on the formulation of a new set of policies and the introduction of innovative ideas to help SMEs reduce their emission levels [5].
One of the best strategies that researchers and policymakers recommend for SMEs to reduce environmental pollution while being competitive is 'green innovation.' Green or environmental innovation involves the introduction of new and innovative products, production processes or methods, and materials that limit the utilization of natural resources and curb the release of environmental pollution and waste in the environment [6,7]. Green innovation can be a sustainable solution for addressing the surmounting environmental challenges of SMEs. Implementation of green practices can enable SMEs to gain a competitive edge and sustain in the long run [8]. However, the implementation of green innovation strategies involves various hurdles and barriers for SMEs, and it is vital for SMEs to properly analyze and address these barriers in order to successfully implement green ideas. Keeping this in view, we designed the objectives of our study as (i) to identify green innovation barriers for SMEs; (ii) to prioritize and rank identified barriers; (iii) to find strategies for these barriers; and (iv) to prioritize and rank the strategies.
To achieve the objectives of our study, we symmetrically combined two multi-criteria decisionmaking techniques with fuzzy set theory. The analysis is divided into three phases. In the initial phase, we identified various barriers to the implementation of green practices for SMEs through an exhaustive literature survey. Later, we classified these barriers into the major barrier categories. Finally, we obtained strategies for these barriers from the experts' feedback and literature survey. In the second phase, we applied fuzzy analytical hierarchy process (FAHP) to obtain weights of major barriers to know the extent to which they impede green innovation. Later, we used a similar process of FAHP to compute the priority weights of sub-barriers. Lastly, we obtained global weights of subbarriers by multiplying their priority weights to their respective major barrier category weights. In the final phase, we used global weights of sub-barriers to rank the strategies for SMEs using fuzzy technique for order of preference by similarity ideal solution (FTOPSIS). The uniqueness of this study is that it studies the understudied SME sector of Saudi Arabia. This study is the first one that identifies and ranks barriers to environmental innovation in Saudi Arabia and also provides strategies to address these barriers. Also, the topic of green innovation, despite having great importance, is still less explored and researched. Moreover, barriers and strategies to green innovation in SMEs evolve and differ depending on the background of a country or a region, so it is important to carry out research specific to a country or a region. However, the framework developed in this study can help carry further research on this topic.
The rest of the study proceeds as follows: Section 2 conducts a literature survey and identifies barriers and strategies to green innovation in the context of Saudi Arabia. Section 3 explains the importance of methods and the aim of using them in this study. Section 4 presents results and discussion, while Section 5 concludes the study.

Related Studies
Green innovation reduces environmental hazards, air pollution, and other negative environmental implications of product use. The term green innovation is broadly categorized into the green process, green product innovation, and green managerial or system innovation [9,10]. Researchers have provided several definitions of green innovation over the past years. We use the terms green innovation and environmental innovation interchangeably in this study. Kemp (2010) [11] put forward the definition of environmental innovation as the "product, an adaptation of a product, process of production, management or service or a novel business model that reduces pollution, environmental hazards, and other adverse impacts of resource utilization compared to relevant business methods and processes." Likewise, Beise and Rennings (2015) [12] and De Marchi (2012) [13] described green innovation as an advanced product, process, or service that is environment-friendly and minimizes environmental risks. Ghisetti et al. (2017) [6] defined green innovation as "a significantly new or improved product, service, process, marketing solution, or organizational change that decreases natural resource use and reduces harmful substances release throughout product life-cycle." However, the implementation of environmental innovation is often faced with several barriers. SMEs particularly lag behind when it comes to adopting green practices. Extensive studies have revealed a variety of barriers to green practices for SMEs. We have summarized in Table 1, a few of the recent studies conducted to identify barriers to green practices and environmental innovation. Table 1. Relevant studies on green innovation practices in small and medium enterprises (SMEs).

Year
Region Findings Method Reference

India
The study identified barriers and suggested solutions to overcome these barriers. The study identified seven major barriers, 26 as sub-barriers, and 20 solutions to address these barriers.
BWM and fuzzy TOPSIS [14] 2018 India This study analyzed the role of green supply chain management barriers in Indian clothing SMEs. Thirty-six barriers to green supply chain practices were identified. Among these 36 barriers, 10 barriers were classified as critical. Barriers having a maximum impact were found to lack regulatory support, complex green process, and system design.
Literature and questionnaire survey [15] 2018 India The study identified green manufacturing barriers for SMEs and large enterprises. Financial incentives, green standard compliance, marketing, management support and commitment, and other associated barriers to green manufacturing were identified.
Interpretive structural modelling [16] 2018 India The study framework to evaluate barriers to the implementation of sustainable supply chain management in textile micro, small, and medium enterprises. The study also provides suggestions to overcome these barriers to achieve a sustainable textile supply chain.
Interpretive structural modeling [17] 2017 General The research was conducted to identify the determinants of green innovation for the last two decades. The study found 23 determinants and classified these determinants into seven categories. A systematic model that showed the relationship between determinants and alternatives to address green innovation barriers for manufacturing SMEs was also discussed.
Literature review [18] 2017 European Union The study assessed the impact of financial barriers on the implementation of green practices with respect to manufacturing SMEs.
The authors revealed that financial barriers are a major impediment to the adoption of environmental innovation. They also found that SMEs substantially neglect the role of financial barriers, although these barriers are crucial and more relevant in the economic cycle. They also proposed some policies to cope with financial barriers to the implementation of green innovation. Equation modeling [6] 2015 France The study identified barriers to the environment innovation in SMEs. The study took a sample of 435 SMEs to assess the extent Regression analysis [19] of SMEs' perception of these barriers. Knowledge barriers, market-related barriers, and financial barriers were classified as the most important ones. The authors found that SMEs that are conducting green innovation face these barriers to a greater extent than SMEs who are not engaged in green practices.

Malaysia
The study reported findings on the barriers impeding SMEs in the implementation of green manufacturing practices. The authors used the Delphi survey technique to obtain consensus from experts on the identification and verification of barriers. The study offers insights to SMEs who plan to transform conventional practices to green ones.

Barriers and Sub-barriers to Green Innovation in Small and Medium Enterprises (SMEs)
After studying recent and most relevant studies, we obtained experts' feedback to finalize barriers in the context of Saudi Arabia since no study has ever been conducted to identify barriers to green innovation for SMEs in Saudi Arabia. Twenty-four barriers were finalized in the context of Saudi Arabia. These barriers were categorized into six main barriers comprising economic barriers (EB), market barriers (MB), political barriers (PB), information barriers (IB), technical barriers (TB), and managerial barriers (MAB). Table 2 lists the selected barriers and sub-barriers.

Strategies to Overcome Barriers to Green Innovation in SMEs
After identifying the important barriers and sub-barriers, this study has determined 10 significant strategies to overcome the barriers in implementing green practices for SMEs. The literature review suggests various strategies for SMEs to overcome these barriers and adopt green innovations. These strategies were also finalized after conducting an exhaustive literature survey. This study, therefore, finalized 10 strategies to overcome these barriers for the implementation of green innovation practices in SMEs (see Table 3). Table 3. List of strategies to overcome barriers to green innovation in SMEs.

Strategy
Code Reference Developing research practices to carryout green innovation in SMEs S1 [51,52] Organizing awareness and training programs in the public institutes to increase awareness of green innovation in SMEs S2 [2,53] Developing environmental management systems for monitoring the systems in SMEs S3 [31,32,54,55] Setting up of green logistics facilities for SMEs S4 [32,54,56] Designing effective green policies by the government to reduce environmental degradation S5 [57,58] Increase R&D practices to design green products S6 [23,52,57] Training entrepreneurs regarding green processes and green purchasing for SMEs S7 [2,59] Training human resources for green innovation activities S8 [60][61][62] The government should provide subsidies and incentives to SMEs for producing green products S9 [2,60] Involving all the stakeholders in environmental management initiatives and purchasing S10 [32,54,55] Taking into account the above provides a literature review, this research study develops a systematic and effective methodology based on FAHP and FTOPSIS approaches for evaluating and prioritizing the barriers and strategies to overcome these barriers to green innovation in SMEs in the context of Saudi Arabia.

Research Framework
The proposed symmetric research framework (FAHP and FTOPSIS) is applied in the context of Saudi Arabia. The study is based on 10 SMEs located in different regions. Names of selected SMEs are not revealed here due to anonymity. Figure 1 presents the proposed methodology of the study. The main theme of the research is to determine barriers that impede the implementation of green innovation practices in selected SMEs and then provide strategies to overcome these barriers and implement sustainable green practices. We consulted 12 experts (managers) to assign weights to barriers and strategies. It is very important to engage qualified and professional experts while implementing any multi-criteria decision method such as fuzzy AHP and fuzzy TOPSIS, since the relevancy and understanding of experts in assigning weights could be conflicting and uncertain. In order to obtain pertinent results and avoid any disagreement among experts, we consulted 12 experienced managers in the study. Therefore, the 12 managers were engaged as respondents in both fuzzy AHP and fuzzy TOPSIS to maintain the consistency and validity of the obtained results.
The main barriers and sub-barriers to green innovation in SMEs have been determined using the FAHP method, and then these obtained barriers were incorporated to FTOPSIS to overcome the barriers for sustainable implementation of green innovations in SMEs.

Analyzing and Overcoming the Barriers to Green Innovation in SMEs of Saudi-Arabia
Literature review

Phase-1 Identification of main-barriers and Sub-barriers
Selecting and finalizing the barriers and sub-barriers Calculating the weights using Fuzzy AHP

Approve weights No
Yes Evaluating the strategies (alternative) using Fuzzy TOPSIS Prioritizing the strategies to overcome barriers

Fuzzy Analytic Hierarchy Process (FAHP) Method
Analytic hierarchy process (AHP) is a widely used technique to solve complex and multifaceted decision-making problems [63,64]. However, AHP is criticized in the literature due to its unbalanced judgment-scale, and lack of ability to incorporate vagueness and uncertainty in decision-making [65,66]. To address these shortcomings of AHP, studies integrate fuzzy with AHP to form FAHP [67]. FAHP in this study is applied in the following steps: Let a matrix be = ( ℎ ) × . Let a fuzzy number be = ( , , ); Step 1: Construct paired comparison matrices using fuzzy numbers.

Fuzzy Technique for Order of Preference by Similarity Ideal Solution (FTOPSIS) Method
TOPSIS method was developed by Hwang and Yoon in 1981 [68]. TOPSIS method develops the relationship or a common idea based on the positive and negative ideal solution. However, in this study, a fuzzy-based TOPSIS method has been employed to obtain more reliable results by minimizing the uncertainty of the decision problem. The fuzzy set theory helps in providing the incomplete information and immeasurable problem under fuzzy environment [69,70]. This method is preferable in evaluating and ranking the alternatives using linguistic variables. Therefore, triangular fuzzy numbers (TFNs) has been used to analyze the alternatives with respect to each of their criteria. Linguistic variables can help in reducing the uncertain problem by converting it into quantitative terms [71]. There are various ways to represent linguistic variables using TFNs; Table 4 shows the linguistic variables scale of the present study. Very Good (VG) (7,8,9) Linguistic variables based on TFNs are shown in the following steps: Step I. Let = ( , , ), = ( , , ) are the two fuzzy numbers; thus their mathematical relation is as follows: Step II. Let = ( , , ) be a TFNs for ∈ . Afterward, the normalized fuzzy number of each is shown as: where = 1,2,3, … , and = 1,2,3, … , For a positive ideal solution (i.e., benefit criteria), the fuzzy normalization process is presented as: where * = max is a benefit type criteria. For negative ideal solution (i.e., cost criteria), the fuzzy normalization process is shown as: = is cost type criteria.
Step III. Construct the fuzzy weighted normalized decision matrix.
Step VI. Rank and select optimal alternatives. After utilizing FTOPSIS method steps, it would provide the ranking of alternatives with respect to ideal and negative ideal solution.

Results and Discussion
In the study, a hybrid decision framework (i.e., FAHP and FTOPSIS) has been used to assess and overcome the barriers to green innovation services in SMEs. The FAHP method has been employed to assess six main barriers and 24 sub-barriers. The comprehensive analysis of main-barriers and subbarriers to green innovation in SMEs is provided in Appendix A. Then, the FTOPSIS method has been used to overcome the barriers by proposing 10 strategies to green innovation in SMEs. This is the first kind of study for Saudi Arabia to implement green innovation practices in SMEs. Thus, the present analysis lays a foundation for stakeholders, policymakers, and governments to determine the decision framework for overcoming the barriers as well as for sustainable implementation of green innovation practices in SMEs of Saudi Arabia.

The Main Barriers Results of FAHP
The FAHP method has identified main barriers results. A total of six main barriers were finalized for green innovation practices through experts' opinion and analysis. Figure 2 presents the weights and ranking of main barriers. The results reveal that political barriers (PB) with a weight of 0.191 is the most influential barrier that impedes the implementation of green innovation in SMEs. The remaining main barriers are ordered as follows: Managerial barriers (MAB) with a weight of 0.181, technical barriers (TB) with a weight of 0.180, information barriers (IB) with a weight of 0.174, economic barriers (EB) with a weight of 0.150, and market barriers (MB) with a weight of 0.123. The analysis is originally made in the context of Saudi Arabia; as such, every country has different economic, market, political, technical, and social conditions [73].  Figure 3 presents the weights and ranking of the sub-barriers with respect to economic barriers (EB). The high green system costs (EB4) with a weight of 0.217, the lack of subsidies and financial incentives (EB3) with a weight of 0.211, and high disposing of hazardous wastes costs (EB5) with a weight of 0.208 have been prioritized as the most influential sub-barriers. Whereas, less payoff (EB2) with a weight of 0.192, and unavailability of bank loans (EB1) with a weight of 0.171 are the least significant sub-barriers towards the implementation of green innovations in SMEs of Saudi Arabia. However, all the analyzed sub-barriers are very critical for the successful implementation of green innovations in SMEs.

The Sub-Barriers Results of FAHP
According to [6], financial support is very important for green innovations; however, green innovation systems are not developed due to improper financial systems. The high prices for purchasing green innovations is also a key barrier or concern for SMEs because the financial budget to handle green activities is very small, and limited financial support schemes act as a critical barrier to green innovation [19]. Thus, the government and policymakers should enhance the financial benefits and reduce the green system costs to SMEs for the development of green innovations.   Figure 4 shows the sub-barriers ranking with respect to market barriers (MB). Therefore, from the MB perspective, the lack of customers' responsiveness (MB2) with a weight of 0.398, and the lack of awareness and knowledge (MB3) with a weight of 0.390 have been ranked as important subbarriers. While inability to access market (MB1) with a weight of 0.212 has been prioritized as the least important sub-barrier towards the successful implementation of green innovations in SMEs. It is important to open doors of the market to access green resources, to produce green products, and to enhance the customers' responsiveness, knowledge, and awareness about green products. The demand for the product entirely depends upon the customers' willingness and choice about the product; green product customers are often unwilling to pay additional money for the product, which impedes innovation efforts due to lack of customer demand [30]. Unfortunately, the customers are unaware of the benefits of green innovation to the environment, which leads to the low demand for green products [29,37]. Therefore, it is important for governments and policymakers to analyze the market barriers to green innovations in SMEs.   It is determined that the government should ease the making of green policies and regulations, making effective environmental policies to take advantage, and initiate training programs for SMEs to incorporate green innovation practices in the country [19]. It is important to have confidence over the government for sustainable deployment of green innovation practices in SMEs; therefore, the government and policymakers are responsible to design and formulate policies for sustainable green innovations.  Figure 6 shows the sub-barriers ranking with respect to information barriers (IB). The results indicate that lack of technological information (IB3) is a key sub-barrier with a weight of 0.258, following lack of ability (IB4), lack of knowledge (IB2), and lack of awareness (IB1), respectively. The lack of technical information refers to the unavailability of green technologies to transform the SMEs into green innovation practices. While lack of knowledge refers to the green practices and legislations among entrepreneurs and employees, they also have a lack of ability to determine environmental prospects. Further, they have no information or lack of awareness to recycle wastage material and reverse logistics facilities. Thus, the government should enhance information and knowledge programs regarding green practices.  Figure 7 presents the sub-barriers ranking with respect to technical barriers (TB). From the TB perspective, the lack of research and development (R&D) capacity (TB2) with a weight of 0.272 was identified to be greatest sub-barrier to the development of green innovation in SMEs. Whereas, complex designing process (TB3) was identified as a moderate significant sub-barrier towards the development of green innovation practices in SMEs. Technological and market uncertainty (TB1), and the lack of technologies (TB4) have been recognized as the least important sub-barriers that impede the use of green practices in SMEs.
The results have a similarity with the past study conduct by Maria et al. [30], in which authors identified a lack of technological expertise as an important barrier to green innovation, because less technical expertise leads to the negative impact over green innovation practices of the enterprise. The sufficient R&D capacities, financial resources, and green innovation provides a benefit to the enterprise or organization and helps them to initiate green innovation products. For any SMEs, the environmental resources are important for long run sustainability. Technical barriers involve the lack of technologies or complex demand patterns for green innovations; therefore, it is important to systematically manage the technologies for green products, which are often considered an important barrier to green innovations [19]. Saudi Arabia is a developing economy with limited technological resources; therefore, the government requires gigantic efforts to involve green innovation practices in SMEs by improving technological services.  Figure 8 shows the sub-barriers ranking with respect to managerial barriers (MAB). Within the managerial barriers (MAB), unwillingness to switch to green practices (MAB3) with a weight of 0.286 was determined as the most dominant sub-barrier to green innovation in SMEs. The rest of the barriers have been ranked as follows: Lack of commitment (MAB2), lack of reward systems (MAB4), and lack of human resources (MAB1), respectively. SMEs are facing many socio-economic and environmental challenges; therefore, it is a reluctance to switch to green practices, and lack of commitment from SME entrepreneurs to implement green innovation practices, as well as lack of human resources for green innovation that are the key barriers in the development of green innovations in SMEs [2]. All these sub-barriers should be reduced or overcome for the sustainable development of SMEs.

The Overall Sub-Barriers Results
In this sub-section, the 24 sub-barriers weights were evaluated, regardless of their grouping. Table 5 presents the final ranking of these overall sub-barriers. The results indicate that implementation of environmental policies (PB3) with a weight of 0.0527 is ranked as the most influential sub-barrier, followed by lack of commitment (MAB2) with a weight of 0.0518, and unwillingness to switch to green practices (MAB3) with a weight of 0.0507, as second and third most significant sub-barriers, respectively. The lack of commitment to the green innovation, and lack of technology to design efficient green products impede a switch over to the green innovation system [43]. The remaining sub-barriers have been ranked as follows: PB2 < TB2 < MB2 < PB1 < MB3 < TB3 < IB3 < TB1 < IB4 < IB2 < IB1 < MAB4 < BP4 < TB4 < MAB1 < EB4 < EB3 < EB5 < EB2 < MB1 < EB1. It is evident that all these considered sub-barriers can impede the development of green innovation in SMEs of Saudi Arabia.

FTOPSIS Results
Various important strategies have been proposed in the study to overcome the main barriers to the development of green innovation practices in SMEs of Saudi Arabia. In this context, the FTOPSIS method has been used to identify and rank green innovation strategies. The analysis of this method has established a fuzzy evaluation matrix using TFNs scale. Appendix B provides the overall analysis of FTOPSIS method. Table 6 presents the final prioritizing order of strategies to overcome the barriers to green innovation in SMEs. The main results indicate that "developing research practices to carry out green innovation in SMEs (S1)" is ranked as the highest green innovation strategy for the development of SMEs. While "increasing research and development (R&D) practices to design green products (S6)," and "developing environmental management systems for monitoring the systems in SMEs (S3)" are the second and third important green innovation strategies to overcome the barriers in the SMEs. The remaining ranking of the strategies (i.e., alternatives) are as follows: S5 > S4 > S9 > S10 > S7 > S2 > S8.
The government needs to develop a clear and systematic decision framework to implement green innovation practices in SMEs of Saudi Arabia. This framework can be determined through policies like technological support, subsidized loans, and environmental tax benefits, etc. It is also important for the government to increase R&D capacity for designing green products for SMEs, as it would help in shifting SMEs to green practices. Moreover, SMEs have resource constraints, and a beginner can face difficulty in developing new technologies and so implementing standard processes can help SMEs to turn green [67]. The study aimed to assess and overcome the barriers to green innovation in SMEs of Saudi Arabia. This study helps governments, policymakers, and stakeholders to evaluate the important barriers that impede the development of green innovation in SMEs. Therefore, this research will be very useful in planning and developing green innovation system in SMEs.

Conclusion
Implementation of green innovation practices, the production of green products, and recycling of waste material or activities in SMEs are still at an initial stage in Saudi Arabia. The SMEs of the country are lagging behind due to their limited capacity-based size. Nowadays, many countries are shifting and implementing their SMEs to green innovation practices, and this can be a solution to their problem by overcoming the barriers. Therefore, this is the very first attempt to evaluate the barriers and strategies to overcome these barriers of green innovation in SMEs in the context of Saudi Arabia. In the study, a comprehensive decision framework has been used to understand these barriers for green practices in the context of SMEs.
To address the research gap, the present study has proposed a symmetric decision support framework (i.e., FAHP and FTOPSIS) to identify and evaluate main barriers and strategies to overcome these barriers to adopting green innovation practices in SMEs. The framework was proposed with the help of existing literature and 12 professional experts of Saudi Arabian SMEs. In the study, a total of six main barriers and 24 sub-barriers were identified, along with 10 strategies to overcome these identified barriers to green innovation in SMEs of Saudi Arabia. The main barriers and sub-barriers were evaluated and ranked through FAHP method. The results indicate that political barriers (PB) are the most vital barriers followed by managerial barriers (MAB) and technical barriers (TB). Then, FTOPSIS methodology was employed to prioritize strategies to overcome the main barriers and sub-barriers to green innovation in SMEs. Developing research practices to carry out green innovation in SMEs (S1) is placed first among strategies, followed by increasing research and development (R&D) practices to design green products (S6), and developing environmental management systems for monitoring the systems in SMEs (S3). Analyzing these strategies can greatly help policymakers and managers to implement green innovation practices in SMEs.
This study has been carried out in a comprehensive way; however, it has several limitations which need to be analyzed in the future research study. This study particularly was undertaken in the context of five SMEs of Saudi Arabia. Therefore, it is important to compare the results of this study with similar SMEs of other countries. Further, every country has its own and different barriers in the implementation of green innovation practices in SMEs. This research has FAHP and FTOPSIS methodology for prioritizing barriers and strategies to overcome the barriers. But, other MCDM methods such as ANP, VIKOR, ELECTRE, and WASPAS can also be used to compare the results for any changes. Moreover, a large number of SMEs can be explored and taken as a case study to statistically validate the findings. Finally, this study has attempted to analyze barriers and strategies to green innovation in SMEs; therefore, further research can shed much more light on this topic.

Acknowledgments:
The authors acknowledge anonymous reviewers for providing their valuable comments to improve this manuscript.

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