Complex societal challenges, such as climate change and environmental degradation, are encumbered by numerous interdependences across different policy issues. Coordination of interdependent policy issues is thus critical. However, coordination challenges persist, partly because coordinating interdependent policy issues among actors often involves high costs. While network governance literature often advocates for management strategies that steer the coordination between actors, little is known about what specific strategies can stimulate the emergence of collaborative relationships suitable for coordination of interdependent policy issues. To address this gap, we develop a typology of four different strategies operationalized as network motifs. We present a simulation modeling approach using Exponential Random Graph Models to evaluate if the identified network strategies facilitate actor coordination of interdependent policy issues and demonstrate the method on empirical data from water governance in Sweden. Results show that coordination of interdependent policy issues is enhanced by shared responsibilities, efforts to broaden expertise, and consideration of issue interdependencies in the search for collaborators. Results show less support for effective coordination of interdependent policy issues through a network manager. Taken together, the paper contributes both theoretical and methodological developments relevant for evaluating progress on coordination of interdependent policy issues and improving network interventions.

Policy actors address complex environmental problems by engaging in multiple and often interdependent policy issues. Policy issue interdependencies imply that efforts by actors to address separate policy issues can either reinforce (‘win–win’) or counteract (‘trade-off’) each other. Thus, if interdependent issues are managed in isolation instead of being coordinated, the most effective and well-balanced solution to the underlying problem might never be realised. This study asks if reinforcing and counteracting interdependencies have different impacts on perception and collaboration. Our empirical study of collaborative water governance in the Norrström basin, Sweden, shows that policy actors often avoid collaborating when the policy issues exhibit reinforcing interdependencies. Our evidence indicates a perceived infeasibility of acting on reinforcing interdependencies. We also find that actors do not consider counteracting interdependencies (‘trade-offs’) at all when they engage in collaboration. Further, even though actors were aware of counteracting and reinforcing interdependencies, our analyses suggest they might be less aware of the former. These findings illustrate that actors either avoid each other due to policy issue interdependencies or, at best, ignore existing interdependencies when engaging in collaboration. Our study highlights the importance of problem perception in accomplishing integrated solutions to complex environmental problems, and of how understandings of different types of interdependencies shape collaboration in environmental governance. 

Countries’ reliance on global food trade networks implies that regionally different climate change impacts on crop yields will be transmitted across borders. This redistribution constitutes a significant challenge for climate adaptation planning and may affect how countries engage in cooperative action. This paper investigates the long-term (2070–2099) potential impacts of climate change on global food trade networks of three key crops: wheat, rice and maize. We propose a simple network model to project how climate change impacts on crop yields may be translated into changes in trade. Combining trade and climate impact data, our analysis proceeds in three steps. First, we use network community detection to analyse how the concentration of global production in present-day trade communities may become disrupted with climate change impacts. Second, we study how countries may change their network position following climate change impacts. Third, we study the total climate-induced change in production plus import within trade communities. Results indicate that the stability of food trade network structures compared to today differs between crops, and that countries’ maize trade is least stable under climate change impacts. Results also project that threats to global food security may depend on production change in a few major global producers, and whether trade communities can balance production and import loss in some vulnerable countries. Overall, our model contributes a baseline analysis of cross-border climate impacts on food trade networks.

The ability to effectively resolve complex environmental problems hinges upon the capacity to address several different challenges in concert. These challenges, what we refer to as policy issues, often relate to one another - they interdepend. Policy issue interdependency has been extensively theorised in the literature, yet few methodological approaches and little empirical evidence exist to translate the concept of policy issue interdependency to the on-the-ground realities facing policy actors in specific cases and contexts. We build from previous studies to develop a methodological procedure that investigates policy issue interdependencies in ways that take into account what measures and possible solutions policy actors have at their disposal in specific cases for specific environmental problems. By applying our methodological procedure to a case of water governance in Sweden, four insights emerged. First, validation by stakeholders confirms that our procedure produces reliable results. Second, we find that many, but certainly not all, policy issues are interdependent. More specifically, different patterns of policy issue interdependencies are associated with the biophysical and the governance spheres, respectively. Third, our results suggest that policy issue interdependencies are most important to consider when the overall level of interdependency is moderate. Last, our study raises new questions about policy actors' perception of policy issue interdependencies. In particular, a key question for future research would be if reinforcing (win-win) or counteracting (trade-off) interdependencies are easier to comprehend and act on for policy actors.

1. Environmental problems often span a set of challenges that each may engage different policy actors across different policy domains. These challenges, or policy issues, nonetheless exhibit interdependencies that may constrain the ability of actors to work together towards joint solutions.

2. Still, we have limited knowledge about whether and how policy issue interdependencies actually shape how actors collaborate.

3. Using data derived from two venues for collaborative water governance in the Norrstrom basin, Sweden, we investigate whether and how policy issues and policy issue interdependencies influence actors' selection of collaborative partners. We test two alternative sets of propositions; one set assumes that partner selection is driven by actors' engagement in policy issues and their interdependencies, while the other set emphasises social positions and actor attributes.

4. Our results show that in one venue, actors' choices of collaborative partner were associated with factors from both sets, but not with policy issue interdependencies specifically. In the other venue, only actor and relational attributes shaped social tie formation. These results suggest that how actors interact does not necessarily align with the policy issues and the policy issue interdependencies defined by the environmental problem they are to address.

5. Our results provide an important step towards arriving at evidence-based recommendations for more effective collaborative efforts in addressing complex environmental problems that no actor can address alone

Many of today’s most pressing environmental problems cross-cut jurisdictional, geographical, and administrative boundaries, creating interdependencies between different locations and between policy issues that no single actor can address alone. In practice, however, environmental policy is still often contained within the traditional responsibilities of the public sector and frequently judged ineffective, particularly in the European context. Whether and how interdependencies are actually associated with collaboration between policy actors has remained difficult to establish.  

This cumulative thesis focuses on interdependent environmental challenges that policy actors need to manage. Specifically, this thesis describes and analyses policy issue interdependencies and how they align with the collaborations of policy actors. In addition, this thesis explores how policy issue interdependencies can be revealed, concretised, and analysed. Interdependencies are effectively represented by networks, both as conceptual models and as analytical methods. Therefore, the studies in this thesis use a multilevel network model to explore the structural alignment between interdependencies and collaboration through the perspective of institutional fit.

This thesis reports findings from two research projects. The first project focuses on policy issue interdependencies relating to regional water degradation. This project describes and analyses these interdependencies in relation to collaborative networks across administrative boundaries (Papers I–III). The second project focuses on climate change impacts that propagate through food trade dependencies. This project contributes insights into the effect of climate change on food trade networks that cross national borders, illustrating a need for global climate adaptation (Paper IV).

Paper I introduces a methodological procedure for assessing policy issue interdependencies and develops policy issue networks by identifying overlapping causal relationships between policy issues and their environmental targets. By applying the procedure empirically to water governance, the paper shows that policy issue interdependencies vary in degree and type. Paper II combines the policy issue networks from Paper I with collaborative networks of policy actors in a multilevel network to analyse the impact policy issue interdependencies have on who policy actors select for collaborative partners and to clarify if and how patterns of collaboration among actors are formed. Paper III differentiates reinforcing and counteracting policy issue interdependencies and studies how these impact the perceptions and collaborations of the actors. Paper IV, shifting the focus to the global level, analyses climate change impacts related to food trade dependencies across national borders. Specifically, Paper IV investigates the impact of climate change on the structure of global food trade networks and therefore contributes a baseline scenario analysis for future studies that investigate policy issue interdependencies and policy actor collaborations on the global level.

In recent times, societal and environmental problems have been exhibiting a growing interconnectedness and interdependency. Based on the idea of institutional fit, interdependency on a problem level should be preferably matched with governance arrangements for effective problem-solving. Still, we know little about the governance of consequential interdependencies across societal and environmental problems. Moreover, knowledge on how the governance of such interdependencies can be effective is even more limited.

In governance contexts, actors break down societal and environmental problems into specific policy issues. When actors engage in policy issues that exhibit interdependency with other policy issues, such as resource extraction and environmental protection, they must seek governance arrangements that go beyond framings of single policy issues as detached from others. Transboundary, collaborative forms of governance are often undertaken by actors as a response to interdependencies between policy issues. This combination of interdependencies and transboundary dimensions consolidates high complexity. Despite extensive literature on collaboration as a governance form and a growing body of research on interdependency between policy issues, few studies integrate these to inform research on the effectiveness of such complex governance systems, where both perspectives are combined. Nor do such studies provide empirical evidence of why the effects of transboundary arrangements for governing interdependencies matter. Without such knowledge, transboundary collaboration can therefore occur without acknowledging which policy issues are interdependent, and in what way. This poses a risk of hampering its effectiveness to solve given policy issues, pertaining to a societal or environmental problem. On that account, this PhD thesis will investigate policy issue interdependencies in the transboundary collaborative governance of the Norrström water basin, situated in the Mideast of Sweden with its outlet in Stockholm. This is a novel approach to understand a key feature of environmental problems that makes them difficult to effectively address, and to further investigate the potential of collaborative governance as way to succeed in such endeavour.

This licentiate thesis addresses this current research gap with the two following papers. Paper I introduces a methodological procedure for identifying and measuring interdependencies between policy issues based on their common, causal relationships. It thereby contributes to advancing the description of policy issues as an indicator of actors’ decision-making and governance effectiveness. Paper II places the policy issue interdependency networks developed in Paper I in relation to governance networks using a multilevel network approach. It analyzes the impact of policy issue interdependencies as exogenous drivers of collaborative governance, providing insights about the evolution of complex governance systems. With these papers, this thesis aims at a concretization and application of interdependent structures at the policy issue level and actor level respectively. It thereby meets an objective highlighted by previous research by integrating interdependent policy issues and collaborative governance, contributing to the study of complex governance systems through its formation, development and effectiveness.

Wetlands are often vital physical and social components of a country's natural capital, as well as providers of ecosystem services to local and national communities. We performed a network analysis to prioritize Sustainable Development Goal (SDG) targets for sustainable development in iconic wetlands and wetlandscapes around the world. The analysis was based on the information and perceptions on 45 wetlandscapes worldwide by 49 wetland researchers of the Global Wetland Ecohydrological Network (GWEN). We identified three 2030 Agenda targets of high priority across the wetlandscapes needed to achieve sustainable development: Target 6.3-Improve water quality; 2.4-Sustainable food production; and 12.2-Sustainable management of resources. Moreover, we found specific feedback mechanisms and synergies between SDG targets in the context of wetlands. The most consistent reinforcing interactions were the influence of Target 12.2 on 8.4-Efficient resource consumption; and that of Target 6.3 on 12.2. The wetlandscapes could be differentiated in four bundles of distinctive priority SDG-targets: Basic human needs, Sustainable tourism, Environmental impact in urban wetlands, and Improving and conserving environment. In general, we find that the SDG groups, targets, and interactions stress that maintaining good water quality and a wise use of wetlandscapes are vital to attaining sustainable development within these sensitive ecosystems.

Indicators used in climate change adaptation planning are largely based on estimates of national or local climate vulnerability. However, classic vulnerability indices do not consider cross-border effects and global interconnections. We attempt to reconcile this need for a broader perspective by developing a global index of exposure to transnational climate impacts, which we define as impacts that are transferred via flows between countries. The index integrates traditional climate vulnerability indicators with spatially-explicit teleconnections between specific countries and constitutes a first approximation of the distribution of such exposure globally. Our results indicate that even though climate risks emerging from within a country's borders are highly correlated with economic development and geography, the distribution of exposure to transnational climate impacts provides a much more complex picture of global vulnerabilities, which neither geography, nor economic development alone can explain sufficiently. This highlights the need to take a cross-scale and multidimensional perspective of climate risk. In order to support more robust adaptation planning, risk assessments should consider both transboundary and far-reaching teleconnected interdependencies between countries.

Climate impacts are predicted to become redistributed through countries’ reliance on food trade networks. This constitutes a significant challenge for climate adaptation planning, and may affect how countries engage in geopolitical and cooperative action. This paper explores potential impacts of climate change on global food trade networks. We ask: i) to what extent might climate change impacts entail a change in the structure of global food trade networks, and ii) how might a change in supply be distributed among the countries in trade blocs? We propose a simple network model to identify how climate change impacts on crops yields may be translated into changes in trade. Combining FAO and ISIMIP data, the model is applied to three key staple crops in the global food system: wheat, rice and maize. We use network community detection and functional cartography to analyse the degree to which global production is concentrated within different trade blocs before and after climate change impacts, and how countries distribute supply depending on their different network role. Our results predict that food trade networks may become more disaggregated as countries, particularly major global producers, may increasingly distribute their trade across modules with climate change impacts. Results also estimate that global food security may much depend on production change in a few major global producers, and whether trade blocs can balance production loss in some vulnerable countries. Overall, our model contributes a baseline scenario analysis of cross-border impacts on food trade networks, and insight into whether current food trade structures will allow counties to maintain current supply.