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[Display omitted] • The evolution of CE metrics based on 544 articles over the period 2011–2023 has been explored. • An inclusive landscape of the thematic trends of metrics in a CE has been presented. • Four research clusters of valuable and usable metric-based tools have been identified. • Research agenda for CE metrics is proposed based on the expert opinions and current challenges. The study provides an inclusive research landscape of the thematic trends and evolution in the field of metrics in the circular economy (CE), and also outlines future perspectives in circularity metrics (C-metrics) by exploring the relevant literature over the period 2011–2023. This study aims to bring further clarity to the wide pool of available c-metrics and orient future research. In this regard, the following research questions are addressed: How has the research landscape of metrics in a CE evolved? What are the prominent research themes and recent trends of C-metrics? And what are the sought-after areas of future research in C-metrics development? To achieve that, this study used data analysis and qualitative content analysis methods to explore the C-metrics related to scientific groundwork based on 544 articles from 187 journals over the period 2011–2023. As a result, (i) six main research themes of C-metrics in the literature are identified; (ii) four recent trends of C-metrics are mapped to highlight the role of C-metrics-based tools in circularity performance assessment, circular design, monitoring and reporting, and database and platforms; and (iii) the future research agenda for C-metrics is proposed based on the current challenges in the studied area, expert opinions, and concerns derived from EU regulations and circular initiatives. The findings provide a better understanding of the evolution of scientific production and trends over time and clarify future research directions for C-metrics corresponding to the ongoing concerns. [ABSTRACT FROM AUTHOR]

Circular product design is widely acknowledged as a foundational step for enterprises to implement and establish viable circular business models. To support this objective, it is vital for industrial enterprises to have an easy-to-apply practical design toolkit that can facilitate the assessment and enhancement of product circularity performance. To address this cross-cutting concern, this article proposes a novel framework called the Design for Product Circularity (DfPC) Toolkit which is an extension of our previous "Closing-Slowing Future-Past" (CSFP) quadrant model, the associated fifteen categories of CE-related products, and the associated product circularity index. The present framework aims to provide comprehensive diagnostics and guidelines to enhance product circularity. The original diagnostic approach presented augments the circularity metrics with a hierarchical calculation principle of a product circularity index, from the elementary circularity indexes of components and parts. The DfPC Toolkit design resulted in the presentation of 15 guidelines for design for product circularity, accompanied by 43 strategies and 225 sub-strategies. The findings of this study contribute to product circularity improvement across various industries by offering recommended alternatives for (re)design. In practice, the present DfPC Toolkit has been deployed on an industrial case study and validated through the proposition of valuable circularity-related improvement targets. The DfPC Toolkit provides a practical approach for industrial enterprises to assess and enhance their product circularity performance, ultimately enabling the transition to circular business models. [Display omitted] • Design for Product Circularity Toolkit is proposed. • An approach to hierarchical computation of circularity maturity diagram is developed. • 15 guidelines for redesign including 43 strategies and 225 sub-strategies are presented. • The tool's applicability through a case study on a centrifugal pump is demonstrated. [ABSTRACT FROM AUTHOR]

The operationalization of circular economy (CE) strategies requires consumer involvement in the acquisition, use, and disposal of products and services. However, encouraging sustainable consumption patterns and CE-oriented consumer behavior to enable the CE in practice is complex and in its infancy stage. This study aims to clarify, frame, and measure consumer contributions to the implementation of the CE in regard to the 10R circular strategies: recover, recycle, repurpose, remanufacture, refurbish, repair, re-use, reduce, rethink, and refuse. The study employs a semi-systematic literature review and a conceptual analysis to develop an inclusive framework of consumer behaviors relating to CE perspectives in practice. The manuscript addresses three goals. First, a tri-dimensional consumer role in contributing to the CE transition is mapped, considering the consumer as (i) a product customer who acquires products or services, (ii) a product user who retains the value of products, and (iii) an end-of-life product holder who discards products. Framing this tri-dimensional contribution is essential to closing the loop on products through (i) careful use and maintenance, (ii) proper collection, and (iii) reuse, repair, or recycling. Second, based on the "closing–slowing and future–past" matrix developed, a CE-related product typology involving fifteen circular product categories is proposed. Third, a five-level hierarchical pyramid for CE-related products is presented to rank the fifteen circular product categories identified from more circular to less circular. Thus, five levels of consumer contributions to the CE, from low to high, are defined as corresponding to the circular product categories identified. As a result, a novel product-centric framework of CE-related consumer behavior to monitor and measure product-level consumer contributions to the CE is developed. The resulting conceptual framework opens up further perspectives for policymakers and producers to more effectively manage the process of directing consumer behavior toward more circular and sustainable consumption alternatives. [Display omitted] [ABSTRACT FROM AUTHOR]

Biofuels have gained much attention as a potentially sustainable alternative to fossil fuels to tackle climate change and energy scarcity. Hence, the increasing global interest in contributing to the biofuel supply chain (BSC), from biomass feedstock to biofuel production, has led to a huge amount of scientific production in recent years. In this vein, techno-economic analysis (TEA) of biofuel production to estimate total costs and revenues is highly important for transitioning towards a bioeconomy. This research aims to provide a comprehensive image of the body of knowledge in TEA evolution within the BSC domain. To this end, a systematic science mapping analysis, supported by a bibliometric analysis, is carried out on 1104 articles from 1986 to 2021. As a result, performance indicators of the scientific production within the target literature are presented to explain how this literature has evolved. Besides, thematic trends and conceptual structures of TEA of biofuel production are discovered. The results show that (i) biofuel production and consumption need promotion through tax measures and price subsidies, (ii) the development of cost-competitive algal biofuels has faced many challenges over recent years, and (iii) TEA of algal biofuels to identify commercial improvements and increase the economic feasibility is still lacking, which calls for more in-depth investigations. Consequently, current challenges and future perspectives of TEA in the BSC domain are rendered. The provided insights enable researchers and decision-makers involved in BSCs to (i) capture the most influential contributors to the field and (ii) identify major research hotspots and potential directions for further development. [Display omitted] • Evolution of techno-economic analysis (TEA) of biofuel production was mapped. • TEA of biofuel production is crucial for transitioning towards a bioeconomy. • Biofuel production needs promotion through tax measures and price subsidies. • The development of cost-competitive algal biofuels has faced many challenges. • TEA of algal biofuels to identify commercial improvements is lacking. [ABSTRACT FROM AUTHOR]