**6. Conclusions**

This study produces three main conclusions that are useful in increasing understanding of the circular economy and sustainability-oriented innovation. First, this study succeeded in mapping 1832 articles on circular economy and sustainability-oriented innovation into seven main clusters. Cluster 1 is about strategic adoption with a total of seven keywords, which contains organizational efforts to collaborate to strengthen the mechanisms for building infrastructure to strengthen the circular economy. Collaboration will have implications for strengthening social capital and exchanging knowledge so as to produce important ideas that are useful in developing environmentally friendly programs. Cluster 2 discusses waste management with six main parameters, while cluster 3 discusses factors affecting the circular economy and sustainability with seven main indicators. Meanwhile, cluster 4 reveals the ecological process and its impact on achieving green development with eight parameters. Furthermore, cluster 5 discusses the circular economy business model and the mechanisms in it, including seven important indicators from the circular supply chain to social innovation. Cluster 6 discusses the topic of circular economy for energy development with seven main parameters. Finally, cluster 7 reveals the circular economy and behavior that supports pro-environmental behavior, environmental legitimacy, and sustainability-oriented innovation.

Second, research on the circular economy and sustainability-oriented innovation concentrates on three main topics, namely business model, transformation, and behavior. These three topics provide opportunities for understanding how the circular economy business model provides insight into all the industrial sectors make efforts to preserve the environment by changing strategies, mechanisms, and routine activities that are environmentally friendly.

This transformation requires the contribution of all elements of the organization, an innovative approach and the achievement of the vision, mission, and objectives of the organization. Finally, the transformation from a linear economy to a circular economy requires a behaviorally relevant approach. Recognizing that environmental conservation is a complex construct, the smallest changes start from the individual aspects of the organization. If each individual has the characteristic of pro-environmental behavior in routine activities, it will form an environmentally friendly organizational culture, environmentally oriented environmental strategies, and strategic planning.

Third, we recommend a total of 16 future agendas from seven clusters resulting from this systematic literature review. Thus, this study is expected to be a starting point and a reference for empirical research conducted in the future. All the ideas expressed based on the seven clusters are strategic efforts to improve the quality and quantity of research on the topic of the circular economy and sustainability-oriented innovation. By identifying various research agendas and opportunities for collaboration, citation and expanding expertise will be achieved towards sustainable development goals.

**Author Contributions:** Conceptualization, I.W.E.A. and V.K.; methodology, I.W.E.A. and N.P.S.S.; software, N.P.S.S.; validation, V.K. and I.W.E.A.; formal analysis, N.P.S.S., N.F. and T.A.; investigation, V.K.; resources, N.P.S.S.; data curation, N.P.S.S., S.K. and T.A.; writing—original draft preparation, I.W.E.A.; writing—review and editing, V.K.; visualization, N.P.S.S. and T.A.; supervision, V.K. and N.F.; project administration, S.K.; funding acquisition, N.F. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Data Availability Statement:** Data available upon request.

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