Is it possible to achieve ecological sustainability with our current democratic system? This question constitutes the democracy-environment nexus which has been a core theme in both the public debate as well as in research ever since the climate issue gained status of being a social problem in the 1970s. We are constantly presented with increasingly alarming science about the consequences of global warming. Yet, the coordinated political responses for effective measures against such consequences, are still missing. The question therefore remains highly relevant. One actor in society that certainly raises frustration about the neglected climate change responses, are the social movements. With a new wave of climate movements, we have seen key figures like Greta Thunberg take a seat at the tables during UN Climate summits. Fridays for Future among many other climate movements are criticizing the current democratic system’s lack of effective environmental policies. It is important to analyze their critique to understand if we need to change the current democratic system in order to tackle climate change. This paper aims to make a contribution to this debate by analyzing statements made by the new Swedish climate movement Återställ Våtmarker. For my analysis I use an analytical chart of the ideal types “ecological democracy” and “environmental democracy”, constructed by Jonathan Pickering, Karin Bäckstrand and David Schlosberg. These ideal types are used as a systematic concept of the democracy-environment nexus. The statements are found in my in-depth interview with one of the organization’s press contacts, on their website as well as in media. By categorizing the statements as either ecological democratic or environmental democratic I intend to conclude whether Återställ Våtmarker has an idea of democracy that poses systemic criticism towards our current system. The findings of this study support that Återställ Våtmarker’s view of democracy has more tendencies towards ecological democracy. In this paper, I have therefore found empirical evidence suggesting that Återställ Våtmarker pose systemic criticism towards our current democratic system.

This study investigates TikTok audios and hashtags through the lens of digital literacy studies, using Ron Scollon's nexus of practice as a theoretical framework. The researcher sought to investigate literacy practices on TikTok, such as how lurkers and posters interact with the app in ways that both define and are defined by their individual identities. Relative to other social media platforms, there is a dearth of research on TikTok. This study contributes to the gap while also building off the findings of Kaye et al., who investigated authorship and (mis)attribution on the app, and Sachs et al.'s claim that Goffman's metaphorical front stage is weakening as users are able to select audiences for identity performance on TikTok. Through ethnographic semi-structured interviews and textual analysis, the researcher found that hashtags and audios work in tandem on TikTok; both hashtags and audios work to traditionally sort videos for users, hashtags offer creators an additional boost to their views, and audios act as an additional sorting mechanism. Furthermore, the study found evidence that audios signal a video's content prior to viewing. The findings additionally opposed Sachs et al.'s claim about the front stage weakening; rather, the participants were acutely aware of the “mortifying ordeal of being known,” with TikTok allowing users to have multiple “front stages'' to perform different aspects of themselves on, while still keeping certain parts to the “backstage.”

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Human mobility is a complex phenomenon emerging from the nexus between social, demographic, economic, political and environmental systems. In this thesis we develop novel mathematical models for the study of complex systems, to improve our understanding of mobility patterns and enhance our ability to predict local and global flows for real-world applications.The first and second chapters introduce the concept of human mobility from the point of view of complex systems science, showing the relation between human movements and their predominant drivers. In the second chapter in particular, we will illustrate the state of the art and a summary of our scientific contributions. The rest of the thesis is divided into three parts: structure, causes and effects.The third chapter is about the structure of a complex system: it represents our methodological contribution to Network Science, and in particular to the problem of network reconstruction and topological analysis. We propose a novel methodological framework for the definition of the topological descriptors of a complex network, when the underlying structure is uncertain. The most used topological descriptors are redefined – even at the level of a single node – as probability distributions, thus eluding the reconstruction phase. With this work we have provided a new approach to study the topological characteristics of complex networks from a probabilistic perspective. The forth chapter deals with the effects of human mobility: it represents our scientific contribution to the debate about the COVID-19 pandemic and its consequences. We present a complex-causal analysis to investigate the relationship between environmental conditions and human activity, considered as the components of a complex socio-environmental system. In particular, we derive the network of relations between different flavors of human mobility data and other social and environmental variables. Moreover, we studied the effects of the restrictions imposed on human mobility – and human activities in general – on the environmental system. Our results highlight a statistically significant qualitative improvement in the environmental variable of interest, but this improvement was not caused solely by the restrictions due to COVID-19 pandemic, such as the lockdown.The fifth and sixth chapters deal with the modelling of causes of human mobility: the former is a concise chapter that illustrate the phenomenon of human displacements caused by environmental disasters. Specifically, we analysed data from different sources to understand the factors involved in shaping mobility patterns after tropical cyclones. The latter presents the Feature-Enriched Radiation Model (FERM), our generalization of the Radiation Model which is a state-of-the-art mathematical model for human mobility. While the original Radiation Model considers only the population as a proxy for mobility drivers, the FERM can handle any type of exogenous information that is used to define the attractiveness of different geographical locations. The model exploits this information to divert the mobility flows towards the most attractive locations, balancing the role of the population distribution. The mobility patterns at different scales can be reshaped, following the exogenous drivers encoded in the features, without neglecting the global configuration of the system.

Residential water heating is linked to the primary source of waterborne disease outbreaks in the United States, and accounts for greater energy demand than the combined water/wastewater utility sector. To date, there has been little research that can guide decision-making with regards to water heater selection and operation to minimize energy costs and the likelihood of waterborne disease. We have outlined three types of systems that currently dominate the marketplace: 1) a standard hot water tank with no hot water recirculation (STAND), 2) a hot water tank with hot water recirculation (RECIRC), and 3) an on-demand tankless hot water system with no hot water recirculation (DEMAND). Not only did the standard system outperform the hot water recirculation system with respect to temperature profile during flushing, but STAND also operated with 32 – 36% more energy efficiency. Although RECIRC did in fact save some water at the tap, when factoring in the energy efficiency reductions and associated water demand, RECIRC actually consumed up to 7 gpd more and cost consumers more money. DEMAND operated with virtually 100% energy efficiency, but cannot be used in many circumstances dependent on scaling and incoming water temperature, and may require expensive upgrades to home electrical systems. RECIRC had greater volumes at risk for pathogen growth when set at the lower end of accepted temperature ranges, and lower volumes at risk when set at the higher end when compared to STAND. RECIRC also tended to have much lower levels of disinfectant residual (40 -850%), 4-6 times as much hydrogen, and 3-20 times more sediment compared to standard tanks without recirculation. DEMAND had very small volumes of water at risk and relatively high levels of disinfection. A comparison study of optimized RECIRC conditions was compared to the baseline modes of operation. Optimization increased energy efficiency 5.5 – 60%, could save consumers 5 – 140% and increased the disinfectant residual up to 560% higher disinfectant residual as compared to the baseline RECIRC system. STAND systems were still between 3 – 55% more energy efficient and could save consumers between $19 - $158 annual on water and electrical costs. Thus, in the context of “green” design, RECIRC systems provide a convenience to consumers in the form of nearly instant hot water, at a cost of higher capital, operating and overall energy costs. / Ph. D.

Rainwater harvesting (RWH) refers to the collection of rainwater for subsequent on-site use. Rainwater is most often used for non-potable purposes including toilet flushing, laundering, landscape and commercial crop irrigation, industry, fire fighting, air-conditioning, and vehicle-washing. This study evaluates the potential impacts of RWH on residential housing on Virginia Tech campus in southwestern Virginia in regards to potable water offset, energy conservation, stormwater mitigation, carbon emission reduction, and financial savings. Potential rainwater collection was estimated from three simulations used to approximate the maximum, average, and minimum range of annual precipitation. Collected rainwater estimates were used to calculate the impacts on the areas of interest. Cumulatively, the sample buildings can collect 3.4 to 5.3 millions of gallons of rainwater — offsetting potable water use and reducing stormwater by an equivalent amount, save 320 to 1842 kWh of energy, and reduce carbon emissions by 650 to 3650 pounds annually. Cumulative savings for the nine buildings from combined water and energy offsets range between $5751 and $9005 USD, not substantial enough to serve as the sole basis of RWH implementation on campus. A significant advantage of RWH relates to the management and improvement of the Stroubles Creek watershed in which the majority of the campus sits. Additionally, RWH implementation would benefit sustainable initiatives and provide Virginia Tech additional opportunities for conservation incentives and environmental stewardship funding. / Master of Science

Renewable energy and economic growth are among the central issues in the two-prongeddisciplines of economics and sustainability. This study explores the impact of renewable energygeneration on economic growth. Utilizing the theoretical framework of Energy Growth Nexus,the research employs a neo-classical production function in several panel data econometricmodels. Sixty nations across the globe are categorized into high-income countries and lowincome countries equally by the World Bank´s income-classifications calculated using theWorld Bank Atlas method. Renewable energy and non-renewable energy generation along withcomponents of production functions such as labor force and investments are examined for theperiod 2000-2021 to identify their impact on GDP. All the variables explored in the study arenormalized by population to account for population differences across countries. Our findingsrobustly support the growth hypothesis, that renewable energy acts as a catalyst to economicdevelopment. The empirical results indicate that there is an association between the renewableenergy and GDP per capita regardless of the nation´s income levels. Robustness checks withdata from a decade preceding the initial analysis are also conducted to ensure the initial findingsare consistent and not an anomaly. The empirical findings from the study offers insights togovernments, energy planners, policymakers, international agencies, and associated bodies toconsider decisions regarding renewable energy transitions. Investments into renewable energyinfrastructure not only enhances the sustainability levels of planet earth but conjointlystimulates economic growth across the globe.

In 2016, member states of the United Nations, by consensus, adopted the New York Declaration for Refugees and Migrants, in which they also agreed to the Comprehensive Refugee Response Framework (CRRF). The framework, arguing for a multi-stakeholder inclusive approach that includes local authorities, was suggested to be a progressive step in establishing an international regime offering predictability in dealing with large scale refugee movements, placing focus on self-reliance, economic inclusion, and support for both refugees and host communities. The CRRF was inserted in the Global Compact on Refugees adopted by UN General Assembly in December 2018. This thesis sets out to enunciate the involvement of local governments as stakeholders in the CRRF and to explore the role of this stakeholder status in refugee local integration solutions, with Uganda as an exemplifying case of refugee hosting countries implementing the CCRF. As an entry point, the thesis posits the following research question: “As stakeholders in the comprehensive refugee response framework, what is the role of local governments in refugee local integration in Uganda?”. The thesis utilizes concepts including stakeholders, local government, decentralisation and integration to construct an analytical framework employed by the thesis.  The thesis claims that as stakeholders in the CRRF, local governments are relevant in enhancing refugee local integration, but this role can only be maximized if and when the decentralized functions and structures of local government are adequately utilised by other stakeholders in the CRRF including the central government and international community. Local governments, under the right circumstances, potentially play a role in ensuring host communities do not impede the enjoyment of refugee rights by mediating refugee-host community relations. But as it stands; the political, administrative, and fiscal functions of local government in Uganda are yet to be adequately harnessed by CRRF structures.

Functions and services provided by soils play an important role for numerous sustainable development goals involving mainly food supply and environmental health. In many regions of the Earth, water erosion is a major threat to soil functions and is mostly related to land-use change or poor agricultural management. Selecting proper soil management practices requires site-specific indicators such as water erosion, which follow a spatio-temporal variation. The aim of this study was to develop monthly soil erosion risk maps for the data-scarce catchment of Ruiru drinking water reservoir located in Kenya. Therefore, the Revised Universal Soil Loss Equation complemented with the cubist–kriging interpolation method was applied. The erodibility map created with digital soil mapping methods (R2 = 0.63) revealed that 46% of the soils in the catchment have medium to high erodibility. The monthly erosion rates showed two distinct potential peaks of soil loss over the course of the year, which are consistent with the bimodal rainy season experienced in central Kenya. A higher soil loss of 2.24 t/ha was estimated for long rains (March–May) as compared to 1.68 t/ha for short rains (October–December). Bare land and cropland are the major contributors to soil loss. Furthermore, spatial maps reveal that areas around the indigenous forest on the western and southern parts of the catchment have the highest erosion risk. These detected erosion risks give the potential to develop efficient and timely soil management strategies, thus allowing continued multi-functional use of land within the soil–food–water nexus.