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Urbanisation and climate change are urging cities to find novel pathways leading to a sustainable future. The urban context may be viewed as a new experimentation space to accelerate the transition to a circular economy. Urban symbiosis and circular economy are emerging concepts attracting more and more attention within the urban context. Moreover, new business models are emerging around sharing and peer-to-peer practices, which are challenging existing roles of actors in society. These developments have an important impact on the flows of resources and use of the city infrastructure, and each research area has taken a different perspective on the analysis of such impacts. This special issue aims to explore what a "circular city" could constitute and how and why cities engage in circularity. The special issue includes seven high-quality papers on theories and practices on circular cities. Actors, concepts, methods, tools, barriers to and enablers of circular cities are discussed and provide a solid base and inspiration for future developments of circular cities.

This paper was accepted for publication in the journal Environmental Innovation and Societal Transitions and the definitive published version is available at http://dx.doi.org/10.1016/j.eist.2017.03.002 ; Urbanisation and climate change are urging cities to chart novel paths towards sustainable futures. Many cities are turning to the alluring 'circular economy' (CE) concept to guide this redirection. The CE concept re-imagines how flows of resources moving through economies might be 'closed'. Here, we explore this new 'circular city' agenda by asking: How are cities adopting CE as a strategy?. We found that political leadership, building adaptable future visions, using experimental approaches (such as living labs), developing contextual knowledge about resource use, and engaging with diverse stakeholders to be important. However, we also expose that there is a lack of consensus on what a circular city constitutes and a need to further untangle the how and why of the circular city concept. The research contributes to the field by outlining emergent cases, identifying a set of common policy strategies, conceptualising a circular city and identifying areas for future research.

Food is an essential part of our daily lives, but simultaneously, it is a major contributor to environmental issues. The growing world population and changing diets are expected to further exacerbate the negative impact of food production and consumption. This article explores how sufficiency business strategies, focused on moderating consumption levels, can be implemented in the food industry to curb demand and thereby overall resource consumption. First, a literature and practice review are conducted to create a conceptual framework for sufficiency business strategies in the food industry. Second, a case study approach is taken to explore the application of sufficiency strategies at Oatly, a company offering plant-based alternatives to dairy. Semi-structured interviews and review of the company's sustainability reports are used as key data sources for the case study. This study contributes to research and practice with a novel framework for business sufficiency strategies in the food industry. Although sufficiency implies consumption moderation, it is suggested that when a company substitutes the consumption of a less sustainable option, growth could be desirable. Future research can expand on viable sufficiency strategies for the private sector, but also strategies to engage different stakeholders, such as government, society, and academia, to accelerate the transition towards a sustainable food system.

The sharing economy has become prominent in the policy, business and academic discourse as a way to achieve greater levels of resource efficiency in sustainability transitions. An example is carsharing, which is regarded as a potential lever for change in sustainable mobility transitions. In this article we, apply the "ecologies of business models" perspective to investigate how carsharing initiatives have coevolved in Sweden. We focus on the city context as a useful unit of analysis to investigate carsharing in four Swedish cities: Gothenburg, Malmö, Stockholm and Umeå. Through qualitative case research, we investigate the following: How did carsharing business models coevolve in the studied cities? It was found that early notions of carsharing date back to the 1970s, but the concept has changed significantly over time, particularly with the emergence of (Internet) technology-based platforms. The findings suggest that carsharing is complementary to existing private car usage in cities, rather than a replacement. Based on this, we suggest pathways for local policymakers to consider when implementing sustainable carsharing solutions. The contributions are threefold: providing an empirical study on the theoretical ecologies of business models concept; understanding how carsharing coevolved in Swedish cities and in relation to wider sustainability and mobility trends; and giving novel insight into the role of local governments

© 2016 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. The transition within business from a linear to a circular economy brings with it a range of practical challenges for companies. The following question is addressed: What are the product design and business model strategies for companies that want to move to a circular economy model? This paper develops a framework of strategies to guide designers and business strategists in the move from a linear to a circular economy. Building on Stahel, the terminology of slowing, closing, and narrowing resource loops is introduced. A list of product design strategies, business model strategies, and examples for key decision-makers in businesses is introduced, to facilitate the move to a circular economy. This framework also opens up a future research agenda for the circular economy. ; Part of this work was supported by ResCoM, which is co-funded by the European Union under EU Seventh Framework Programme (FP7), Grant agreement number: 603843. We would like to thank the ResCoM team for their support and encouraging discussions on the topic of the circular economy.