Currently, there are many different interpretations in the literature of what a circular economy is and how it functions. As cities are still facing challenges to become fully sustainable, the need for a comprehensive analysis of how the circular economy can be implemented in urban areas is increasing. This article aims at outlining circular cities by their key characteristics and to further explore and provide a framework for fostering circularity at the city level. In order to achieve this goal, we performed a systematic review and analyzed key papers published in the field of circular economy to determine how circular economy practices form circular cities. We discovered that cities play a focal role in facilitating the transition towards circularity through the closing of the loops, recirculation, technical innovation, policy elaboration and citizens’ support. However, city policymakers are still uncertain about how a circular city looks like and what its purpose is, as views are ranging from a strategic ambition to a niche concept of a smart city. Such uncertainty brings challenges, especially in the transition phase that many cities are in at the moment. This further implies that circular economy applied at the urban level still needs effort and innovation to successfully pass the transition phase from the linear economy. Therefore, lastly, we developed a framework model that can be adapted in other cities to facilitate their transition to circular cities.

One of the major obstacles to the adoption of the circular economy is the lack of consumer interest and awareness. Despite this, the unique role of consumers in the circular economy is an understudied topic, as the literature tends to focus rather on the application of circular practices in the organizational and industrial sectors. This paper aims to examine the individual-level factors that have an influence over circular purchasing behavior. Specifically, this paper elaborates an explicative path model of purchasing circular products that takes into account environmental concern, climate skepticism, and the attitudinal factor towards circular products. The final sample consisted of 566 respondents from Romania. Our findings showed that environmental concern has a positive significant impact on circular purchase behaviour and this relationship is mediated by the attitude towards circular products. Moreover, those with high levels of climate skepticism showed an increased level of perceived greenwashing among organizations.

As the world continues to urbanize, it is necessary to identify and implement new urban development models and strategies in order to meet the challenges of sustainable development. As cities continue to face challenges in becoming fully circular, the need to establish a framework to measure the circular economy in urban areas grows. Many definitions for circular cities have been developed and addressed in recent years, as have numerous indicators. To make the transition to a circular city, we must integrate the findings and develop a general definition and measurement framework. This article aims at outlining a framework for circular cities indicators based on their key characteristics, as well providing directions for fostering circularity at the city level. To accomplish this goal, we conducted a systematic review and analyzed key papers published in the field of circular economy to determine how circular cities are measured. Choosing the right indicators to use for developing, monitoring, and evaluating circular cities is a difficult task for urban policymakers, managers, and planners. This highlights the significance of standardized frameworks for urban indicators. As a result, the authors propose a framework and highlight some key points about circular cities and smart urban metabolism.

The notion of Corporate Environmental Responsibility has been extensively researched in the literature so far, but less is known about how this concept fits into the circular economy paradigm. We performed a moderated mediation analysis in order to identify the mechanism that links corporate environmental responsibility with readiness for change towards a circular economy business model. The findings from 311 respondents show that there is a positive association between corporate environmental responsibility and the readiness for change to a circular model, mediated by perceived circular economy drivers. In addition, perceived circular economy barriers hinder this positive relationship, acting as a buffer. These findings can further contribute to the elaboration of a conceptual framework for embedding circular economy in the corporate social responsibility strategies of organizations.

Since they are more environmentally acceptable than their chemically synthesized counterparts, biosurfactants are used in a wide range of environmental applications. However, less research has been done on biosurfactants within the context of the circular economy, despite their theoretical potential to fulfill a number of circular economy ambitions, including closing the consumption loop, regenerating natural systems, and maintaining resource value within the system. Hence, the main objective of this review is to identify and analyze the contributions of biosurfactants to the implementation of the circular economy. A final sample of 30 papers from the Web of Science database was examined. We identified five broad categories of contributions: waste stream-derived production, combating food waste, strengthening soil health, and improving the efficiency of water resources. We concluded that, while manufacturing biosurfactants from waste streams can reduce production costs, optimizing yield remains a contentious issue that complicates the adoption of biosurfactants into the circular economy framework.

Cigarette butts continue to be a significantly detrimental challenge for both human health and the quality of the environment and life in general. The escalating accumulation of inadequately discarded cigarette butts continues unabated, in spite of the myriad legislative procedures that have been instituted by authorities with the objective of incentivizing diminution of this phenomenon. For decades, the scientific literature has discussed the importance of smokers’ behavior and beliefs in contributing to the problem. Thus, the objective of this study is to analyze cigarette butt littering behavior using a survey-based questionnaire. A total of 1643 complete responses were collected from Romanian smokers addressing their knowledge, practices, and views regarding the disposal of cigarette butts. According to the findings, awareness about the impacts and characteristics of cigarette butts is problematic, as are smokers’ self-reported explanations for their conduct. Specifically, more than 30% of the sample stated that cigarette butts are biodegradable, and 31.5% believe that cigarette butts are not toxic to the environment. The results also showed that only 19.7% of the smokers strongly believed that they should be considered accountable for their behavior. Future study directions are provided to advance studies in this area and improve present approaches to lessen the frequency of this behavior.