**5. Considerations and Research's Future Line**

The circular economy provides a fundamental input for creating sustainability-oriented innovation in this transitional model. Waste management, green product development, pro-environmental behavior, and green technology are the main drivers that form the basis for the transition to a sustainability-oriented innovation model. The fundamental dimensions of circular economy and sustainability-oriented innovation are behavior that manifests in the form of green human resource management, green intellectual capital, environmental orientation, and environmental commitment. Green behavior is the backbone of how the circular economy can be applied to build sustainability-oriented innovations. In addition, it is necessary to strengthen communication for knowledge transfers so as to increase creativity [105,106].

At this stage, it is necessary to pay attention to various obstacles such as a system that does not support a circular economy, has limited resources, and exhibits resistance to technology. As such, companies that are able to explore all green behaviors will have long-term environmental strategies and establish environmental organizational legitimacy. Regarding waste management, companies need to design environmentally friendly products and implement eco-designs and even waste recycling. In this stage, the process starts from the determination and selection of raw materials so as to reduce production waste [107,108].

This study seeks to identify the various conditions necessary to advance sustainabilityoriented innovation through the circular economy. The number of articles in each cluster of bibliographic coupling shows that the literature recognizes the importance of the interaction between stakeholder engagement, waste management, and the identification of factors in the circular economy (clusters 1–3). However, other emerging topics, reflected in clusters 4–7, are also worth considering and developing, such as ecological processes and their impacts, circular economy business model mechanisms, and circular economy business model for development. As such, an exploration of dynamic resource capabilities and internal resources and activities is needed to take advantage of opportunities to strengthen sustainability-oriented innovation.

In addition, the literature shows the need to expand research on sustainability-oriented innovation in a circular economy to all industrial sectors given that many studies focus on specific sectors, such as manufacturing and sectors dealing with biological cycles. There is a need to research all industry sectors, as this represents a more efficient and effective way to introduce innovations and identify new market opportunities. Opportunities for the circular economy will enable a more rational use of raw materials and energy sources. Moreover, overall, the studies only focus on European countries, so there is a need to explore developing countries and capture differences due to regulations, social and cultural conditions, markets, and technology. The role of consumers in sustainability-oriented innovation also needs serious attention because they are the main contributors and users of environmentally friendly products. Finally, we suggest a longitudinal study to conduct empirical studies of organizations that are adopting circular economy and sustainabilityoriented innovations around the world. The transition to clean energy through the use of sustainability-oriented innovation and the introduction of sustainable energy technology in the context of a circular economy can help reduce greenhouse gas emissions in industries.

This study also succeeded in identifying organizational internal factors, such as campaigning for pro-environmental behavior, implementing green human resource management, green intellectual capital, environmental orientation, environmental commitment, and creativity. While they are external factors, more emphasis is placed on optimizing green economic incentives and environmental knowledge sharing towards environmental organizational legitimacy. Finally, this study maps out the main topics in the literature at the intersection between sustainability-oriented innovation and themes related to the circular economy so that it is expected to serve as a starting point for conducting future research (Table 1). This study differs from previous systematic reviews, primarily in the extent and temporal range of the articles analyzed, including a large number of recent articles that convey the increasing prominence of this theme. However, utilizing only one database is a limitation that may have prevented the inclusion of relevant research studies.


**Table 1.** Suggestion for future research.
