Sustainability Narratives as Transformative Solution Pathways: Zooming in on the Circular Economy

The circular economy can be understood as one of the sustainability narratives (along with, e.g., the bioeconomy, the green economy and the sharing economy), currently relevant in academia, business and policymaking. Sustainability narratives are characterized by a distinctive set of transferable and scalable solutions, addressing resource/services use and distribution in social-ecological-technical systems. Core solutions in the circular economy are technologically-driven improvements towards reductions of inputs/outputs in production and consumption systems. However, the conceptual diversity of the circular economy is such that it can, like other sustainability narratives, serve multiple sustainability discourses (e.g., ecological modernization, sustainable development and degrowth). In order to cater to societal needs within the planet’s biophysical boundaries, the contribution of the circular economy needs to be strengthened in regard to the protection of biodiversity and ecosystems and to the just distribution of resources, opportunities and prosperity. Socio-cultural change should be understood as complementary to technology- and private sector-driven solutions. While circular economy principles are meant to be translated into tailored micro- and macro- level strategies based on context-specific characteristics and needs, the causal connections between units or geographical regions are a crucial issue for sustainability. The overall co-evolution and harmonization of multiple narratives towards coherent sustainability pathways should strive towards decreasing dependence on fossil resources, reversing biodiversity loss and ecosystems degradation and enabling a quality life for all people. The conclusions of this article provide key points that can further guide analyses and implementation of the circular economy in the context of sustainability transformations.

the circular economy in the context of sustainability transformations. Section 2 introduces and refines the notion of sustainability narratives. In Section 3, the notion of sustainability narrative is used to outline a review of the circular economy. In Section 4, three key considerations are spelled out about the circular economy potential to contribute to sustainability transformations, and a set of key questions are provided to further guide its analysis and implementation.

Sustainability Narratives as Pathways of Change
Some articles have recently used the term 'narratives' in reference to concepts such as the circular economy, the bioeconomy, the green economy, degrowth or postgrowth [27,35,37,50,52,72,78]. In some of these articles, the term is used in a generic way to mean a storyline recurrent in policymaking, academia, the media and/or other contexts. The term 'narrative' has a long tradition in social science and especially in organization studies [6,16]. Narration is at the basis of any form of human communication. In this article, the term 'sustainability narrative' is used to identify macro-concepts that frame and address one or multiple sustainability problems and offer a distinctive set of transferable and scalable solutions (based also on previous definitions [37,50]). In particular, narratives address strategic issues at the core of sustainability challenges, suggesting, for instance, which and/or how resources and services should be used and distributed across societal actors (e.g., considerations regarding rural-urban and North-South dynamics) ( Table 1). I further suggest that sustainability narratives are characterized by (a) a high degree of conceptual plasticity across stakeholders; (b) a quintessential core of archetypical solutions; and (c) a tailored implementation leveraging and addressing contextual characteristics and needs (Fig. 2). It can be argued that the implementation of individual and combined narratives contributes to shaping pathways of change in socio-technical and social-ecological systems [50].
Narratives may address specific systems (urban, industrial, agricultural, natural or seminatural), but generally encompass or are applicable to multiple systems. Some narratives are currently mainstreamed at the regional or global level in policymaking or in organization strategies (e.g., the bioeconomy and the circular economy), while some may emerge more  [47]). On the left: multiple narratives (arrows) converge/diverge contributing to shape sustainability pathways. On the right: desirable pathways should fulfil intra-/inter-generational needs while operating within planetary boundaries from citizens' initiatives (e.g., sufficiency). Solutions proposed by individual narratives have potentially global or regional relevance and applicability, but can be fine-tuned to specific contexts. Consequently, 'narratives are not merely stories, but they function as justification for particular interventions' ( [50], p. 394).
Narratives are adopted by societal actors such as policymakers, think tanks, NGOs, business organizations and research institutes to legitimize and frame their work. In turn, societal actors further develop dominant and emerging narratives, with a diversity of critical interpretations [17][18][19]. It is here necessary to clarify why the term narrative rather than that  Reducing resource inputs, waste and emissions by keeping material and energy flows within production and consumption systems (e.g., long-lasting design; material/energy efficiency; reuse and remanufacturing preferred over recycling) (e.g., [43]). Bioeconomy Using biological resources to replace fossil-origin products and services, based on knowledge and innovation (e.g., the development of innovative and high-value bio-based goods and services) (e.g., [9]). Green economy 1 Protecting and enhancing ecological functions to support human well-being (e.g., ecosystem services accounting, ecosystem conservation and restoration, nature-based solutions and green infrastructures) [7]. Sharing economy Improving sharing potential of existing products and services (e.g., shared ownership and multi-functionality) (e.g., [29]). Sufficiency Reconsidering superfluous consumption, reconnecting consumption to well-being and satisfaction of needs and improving self-sufficiency at the system level (e.g., refusing to produce or buy, producing and buying local) (e.g., [69]).
of discourse is used. In discourse analysis, discourses are defined as 'socio-cultural meaning structures' identified through 'general characteristics of text, speech or the symbolic aspect of actions' ( [48], p. 447). The assumption is that 'reality is constructed through processes of social meaning-making, relying on the use of language as well as social practices' (ibid.). Certain discourses and meta-discourses have been found to dominate environmental policies, as well as the scholarly literature, including the discourses of ecological modernization, environmental neoliberalism and sustainable development. The bioeconomy, for instance, has been described as a new emerging discourse or meta-discourse or as a new arena reproducing old discourses [2,44,64]. Leipold et al. ([48] p. 446) have argued that 'ecological modernization discourses [ …] are continuously reinterpreted, for instance in the shape of "green," "circular" or "bio-economy" discourses.' Following these line of thoughts, this article suggests that compared to discourses, narratives such as the green economy, the bioeconomy and the circular economy present more specific sets of solutions (Table 1). Such narratives are often associated with a certain discourse (e.g., ecological modernization and sustainable development), but (due to their inherent conceptual diversity) can also transcend and be adapted to serve multiple discourses (as suggested in, e.g., [10,15,32,78]).
There is an emerging understanding that solutions from multiple sustainability narratives (Table 1) need to be interpreted as complementary and synergic. For instance, the circular bioeconomy has recently been defined as (more than) the combination of the individual ideas of the circular economy and the bioeconomy, advocating for the development of bio-based products within a logic of resource circularity [20,39,74,77,79]. An explorative qualitative study based on the perspectives of sustainability researchers suggested that there is a potential to couple circular (e.g., efficiency, recycling, reusing and upcycling) and green economy solutions (e.g., engaging business, customers and investors in the conservation of biodiversity and ecosystems) [19]. Palahí et al. [51] recently proposed a series of action points based on a biodiversity-based circular bioeconomy, in order to rethink industrial, urban, food and health systems and promote participation and a more equitable distribution of prosperity. Furthermore, the term 'nature-positive economy' has very recently emerged in the context of sustainable business and finance [49,82]. The expression appears to be an umbrella term for different kinds of solutions across multiple human-environment systems and sectors, including land and ocean, food systems, mobility, infrastructures and the built environment, energy and extractives. Nature-positive solutions include, for instance, circular and resource-efficient models, planet-compatible consumption, sustainable materials and energy, biomimicry, nature-based solutions and green infrastructures, as well as remediation, protection, compensation and regeneration of natural systems. Different narratives or solution types may, however, present conflictual elements in their practical implementation, because as pointed out by Giampietro and Funtowicz ([35], p. 68), they 'compete for the same resourcesland, energy, water, minerals'.

The Circular Economy as a Sustainability Narrative
The circular economy has emerged during the past decade as a politically relevant [24,25,58] and practitioner-driven [76] concept, with transformative potential rooted in a longer historical tradition, drawing from industrial ecology and cleaner production [10,13,81]. The circular economy can be described as an example of a sustainability narrative, following the definition provided in Section 2.
A high degree of conceptual plasticity among stakeholders is central to the current renaissance of the circular economy. The social science literature on the circular economy has recently flourished with an abundance of articles examining the circular economy as a controversial, dynamic and heterogeneous concept [5,31,33,45,46,54,56]. The circular economy has been contextualized against national and international agendas and processes [11,21,53,71] or against the concepts of strong sustainability and degrowth (e.g., [12,33,72]). The conceptual and practical limitations of the circular economy with regard to sustainability have been highlighted (e.g., [45,55]). Often, the circular economy definitions adopted by scholars and practitioners have not been explicitly linked to sustainable development, and the economic dimension has been emphasized over environmental considerations [43]. One key expectation is that circular solutions would enable the decoupling of economic growth from environmental degradation, but absolute decoupling remains undemonstrated [35,52,62,80]. While circular solutions are supposed to mitigate the pressure on biodiversity and ecosystems through the reduction of resource extraction and waste emission, leakage and rebound remain central challenges to progress towards environmental goals [15,68]. In addition, the potential role of biodiversity and ecosystems to serve functions and solve problems in artificial systems, coupled with circular economy solutions, remains underemphasized [8]. The social dimension, including equity and justice (inter and intragenerational, including considerations of North-South dynamics), has also been identified as a problematic gap area [11,15,43,55,56].
[U]nequal North-South power relations characterise the functioning of the existing (circular) economy ( [70], p. 12), particularly with regard to value chain opportunities and to waste cycles. It appears evident that interpretations of the circular economy range widely, from more technical and conservative to more inclusive and radical interpretations. The latter call for a 'socio-cultural change […] transforming consumption and production structures based on materialism, convenience, and ownership to ones based on collaborative consumption, sharing economies and use-value' ( [10], p. 6), de facto incorporating elements from the sharing economy. Despite the diversity of understandings in the scientific and practitioner literature, more holistic and transformational solutions still appear to be missing from European Union policies [11].
The quintessential core of archetypical solutions in the circular economy-comparatively to other narratives-is related to limiting resource inputs and waste and emission outputs in production and consumption systems, with the intent to retain material and energy and value for as long as possible. While in practice circular economy principles have often been interpreted as efficiency, recycling and waste management (as found in e.g. [3,10,34,38,43]), several scholars and practitioners advocate the need to embrace a much more systemic interpretation (as per the diversity described in the paragraph above). The spectrum of circular economy principles is captured by the various 'Rs' frameworks, ranging from the 3Rs (reduction, reuse and recycling) to the 10Rs (refuse, reduce, resell/reuse, repair, refurbish, remanufacture, repurpose, recycle, recover and re-mine) [66]. Much of the change envisioned in developed economies is based on technological innovation and improvement (backed by policy support), which is also largely expected to mediate consumer (or user) engagement ( [40]). However, a discussion about the active role of consumers or users is increasingly emerging as a key for the implementation of the circular economy. Consumer choices are especially relevant for the initial steps of the 10R framework [66], and lack of consumer interest has been identified as the most notable barrier to the circular economy in the European Union, based on experts' opinions [42].
A tailored implementation leveraging and addressing contextual peculiarities and needs is fundamental to the concrete and successful implementation of circular economy national or organizational strategies. While the principles of the circular economy are globally relevant (set aside from the conceptual diversity described above), national, as well as meso-and microlevel strategies need to be accommodated in the existing territorial reality, including ecological, demographic, geo-political, cultural, socio-economic and industrial structures. An important point here is the roles and expectations laid on different types of actors enabling change, based on the context, from large corporate to smaller or even informal actors [70]. Taking forest systems as an example, in forest-rich Nordic countries, such as Finland and Sweden, the related industry has a long tradition of closed-loop patterns in production facilities that 'typically operate closely with local communities, providing jobs and district heating as well as waste disposal' in a 'symbiotic industrial setting (which clearly follows the CE [i.e., circular economy] philosophy)' ( [59], p. 1298). Circular (bio) economy strategy in such a finely concerted context will be different from those of southern Europe countries, such as Italy, that point towards improving the use of agro-forest residues and enhancing cultural and human capital, as well as the rich diversity of forest resources [26]. While contextual diversity is physiological, it may result in an uneven development and implementation of solutions within and between institutions and industries [13].

Conclusions
This article examined the role of the circular economy in the context of societal transformations towards sustainability, suggesting that the circular economy can be understood as one of the narrative framing and addressing sustainability challenges. The circular economy largely does so from a perspective of economic renewal and environmental improvements, but with an increasing diversity of more radical interpretations (at least in the scholarly literature). The circular economy narrative is recognizable based on a distinctive set of archetypical solutions, which overall are aimed at retaining resources and value in production and consumption systems, largely through the mediation of technology. However, the ability of the circular economy to address the fundamental causes of sustainability (wicked) problems, and thus to provide 'deeply leveraged' solutions, is dependent on the way the narrative is understood and accordingly implemented. In fact, given the heterogeneity of interpretations, the circular economy, like other sustainability narratives, can serve multiple discourses (e.g., ecological modernization, sustainable development and de-growth). Three key considerations are flagged in this article regarding the sustainability potential of the circular economy, with the hope that these can be of use beyond scholarly work, to practitioners and alike.
First, in order to cater to societal needs within the biophysical boundaries of the planet, the links and contribution of the circular economy to ecological and social goals need to be strengthened, especially in regard to biodiversity and ecosystems, and to resource distribution and justice. Socio-cultural change should be understood as complementary to technology-and private sector-driven solutions.
Second, the global relevance of circular economy solutions is supposed to be operationalized through tailored strategies, by addressing and leveraging the contextual characteristics and needs of the unit to be changed (e.g., country, municipality, industry, organization and product). The connections and repercussions of individual units or geographical regions on others are a fundamental issue to guarantee a more sustainable and just circular economy.
Third, multiple sustainability narratives and their sets of solutions (Section 2 and Table 1) must be considered and implemented through complementary and synergic approaches. The co-evolution and harmonization of different narratives should strive towards decreasing societal dependence on fossil resources, reversing biodiversity loss and ecosystems degradation, and enabling a just redistribution of prosperity and a quality life for all people.
The following open questions are proposed that can further guide the conceptual analysis and practical implementation of the circular economy:

Declaration
Conflict of Interest The author declares no conflict of interest.
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