There are numerous problems in the world that need to be dealt with in order to achieve sustainable development. The energy system has significant negative impacts on many of these problems, and there is a need for a transition towards more sustainable energy. Sweden has already started this transition and is using large amounts of renewable energy. However, within the transport sector and the manufacturing sector in particular, large amounts of fossil fuels are still used. Biogas is one alternative that can help solve several sustainability problems and that could be part of a future more sustainable energy system. However, it is not certain what biogas is most suitable to be used for. The aim of this thesis is to investigate how biogas should be used in a future more sustainable energy system, by answering three research questions: 1) In what ways can biogas be used in a more sustainable energy system? 2) How can we assess whether biogas is suitable in a specific context? and 3) What determines whether it is easy or difficult for a user to start using biogas? These questions are explored in a Swedish context using four appended articles, which are based on two collaborative projects using a combination of workshops, literature reviews and interviews. Biogas can be used for heat, electricity or fuel in the manufacturing or transport sector. In Sweden, heat and electricity are mainly of interest for smaller production scales, while production on larger scales will likely be dominated by upgrading mostly to CBG but also to LBG. CBG can be used for less energy-intensive purposes, such as cars or buses, while the growing interest in LBG in Sweden may open up new market segments for biogas which are more energy-intensive, such as heavy trucks or shipping, or in geographical locations that are further away from the site of production. Several sustainability assessment methods exist that can be used to evaluate whether biogas is suitable in a specific context, such as multi-criteria assessments or scenario analyses. These methods can include a number of different aspects that are relevant to biogas use, such as GHG emissions, safety issues, and the vitality of the surrounding region. In order to introduce biogas, six main factors were identified that can make this easier or more difficult: technical maturity, tank volume, distance between the producer and the user, scale of energy use, policies and costs, and strategies of individual organizations. Overall, the rise in LBG production creates new opportunities for biogas use in both geographical and usage areas that did not previously use biogas. There is no simple answer to what biogas should be used for in the future – rather, this depends on the circumstances. It is also possible that the usage areas that are most suitable now for biogas might not be the most suitable areas in the future, depending on developments within, for example, the electricity system and hydrogen. However, CBG and LBG are likely to dominate biogas production in Sweden until then.

This report explores an alternative housing policy to Sweden’s overpriced and problematic housing situation. Research has revolved around how flexible frameworks of Swedish regulations and standardizations in the housing policy can improve sustainability through planning participation and self-building processes. Analysis has been conducted primarily through literature reviews and fieldwork where case studies have been compared relative to how participatory methods and self-built housing construction have been pertinent for their local development in the housing policy. The results provide urban housing solutions that contribute to diverse residential areas and reduce segregated neighborhoods. Furthermore, it demonstrates comprehensive social sustainabilities when residents have actively participated in the planning and construction of their neighborhood. An increased knowledge accumulated from participating and self-building also results in economic and environmental sustainability. This report strives for solutions to complex building regulations and standardizations, which must be adjusted for non-professionals. However, the results showed the difficulties in achieving a system change since political oscillations obstruct an alternative housing policy by concentrating on economic growth. Although there are difficulties within the economic-political systems, the analysis of the case studies reveals the potentialities of collaboration between municipalities and autonomous neighborhoods, which have been formulated through exceptional regulation plans. By reconsidering development where the economy is not at the center, the research demonstrates how municipalities can achieve social, ecological, and cultural growth by implementing an alternative housing policy to the existing one. These values are outcompeted by economic growth and must be re-established in society to achieve democratic sustainability. The current housing affordability crisis stresses the importance of alternatives for an equity housing policy, where self-building and participatory design methods must be accentuated in urban development in Sweden. The result of this report can operate as a platform for innovative housing development within urban contexts for self-builders and municipalities.

There is a lack of academic knowledge concerning mechanisms through which sustainable transitions are promoted. Sustainable transitions in the infrastructure system are key to achieve multiple other SDGs, and the infrastructure development gap is particularly critical in developing countries. Agenda 2030 clearly states the importance of joint action. It is, therefore, relevant to investigate how sustainable transitions can be promoted through collaborations between public and private actors. Specifically, how sustainable transitions in the infrastructure system in low-income countries can be promoted. The notion of public-private partnerships (PPPs) was used to describe collaboration, and sociotechnical system (STS) transitions were used to describe transitions. To examine how PPPs can promote transitions in STS, an Ethiopian case study was conducted. The case used was a technical and vocational school called HDECOVA located in Addis Ababa. A collaborative project between public and private actors. The empirical data was obtained from key actors in the partnership surrounding HDECOVA, both in the form of interviews and documents. To analyze the empirical data, a theoretical and conceptual framework was synthesized borrowing from theories on STS, PPPs, the holistic transition framework Multi-Level Perspective (MLP) and Principal-Agent Theory. The result showed HDECOVA has affected sustainable transitions in the infrastructure system, mainly through effects on the labor market and the education system. The results showed that the mechanisms, through which HDECOVA has promoted shifts in systems, are mainly scaling up and decreasing skill gaps. The results suggest that HDECOVA has successfully promoted sustainable transitions by being aligned with identified development challenges in the infrastructure system. On this basis, it can be suggested that PPPs can promote sustainable transitions by affecting regime- and niche levels of the system.

Worsening climate change impacts, particularly in coastal areas, are forcing urban planners and designers to find new approaches to govern cities. Traditional government approaches are failing to equip cities with effective strategies on how to implement sustainable interventions such as green and blue infrastructure. Adaptive governance has emerged as a way of dealing with the inherent uncertainty and unpredictability of complex social-ecological systems. It is neither top-down nor bottom-up but involves innovative ways of solving problems with emphasis on collaborative decision-making. This research focuses specifically on how collaboration is undertaken in adaptive governance processes by examining The Soul of Nørrebro case study—an integrated urban design and climate adaptation project for Hans Tavsens Park and Korsgade in Copenhagen, Denmark. Through desk study and interviews, the study identifies which stakeholders are involved in collaborative decision-making processes and how stakeholders envision, implement, and contest collaborative decision-making in The Soul of Nørrebro green and blue infrastructure project. This research found that participation from a wide range of local stakeholders and citizens is an integral part of redesigning public space, as it helps create cohesive, just, and ecologically productive environments. However, trade-offs that result in political decisions that are desirable to some and not to others cannot be avoided in the end. While certain setbacks were unavoidable, others that were encountered could have perhaps been prevented through increased transdisciplinary and representative collaboration.