In this PhD study, I aim to deepen our understanding of the influence of major mycorrhizal types, namely arbuscular mycorrhizae (AM) and ectomycorrhizae (EM), on the global soil carbon cycle and... Show moreIn this PhD study, I aim to deepen our understanding of the influence of major mycorrhizal types, namely arbuscular mycorrhizae (AM) and ectomycorrhizae (EM), on the global soil carbon cycle and their potential distribution changes under future environmental shifts. The investigation comprises two main perspectives: Firstly, Chapter 2 delves into their direct impact on fungal biomass input to the soil via lab experiments. Secondly, Chapters 3, 4, and 5 explore their role in mediating litter decomposition through modeling. This thesis sheds light on the significance of mycorrhizal fungi in the soil carbon cycle and underscores the necessity of accounting for their effects when analyzing global soil carbon dynamics. Additionally, the research underscores the importance of understanding mycorrhizal fungi responses to environmental changes, given their sensitivity to factors like temperature and precipitation. Show less
Decarbonizing the building stock is critical for realizing the climate-neutral target for the Netherlands. This thesis uses multi-source data, mainly including GIS data of building footprints and... Show moreDecarbonizing the building stock is critical for realizing the climate-neutral target for the Netherlands. This thesis uses multi-source data, mainly including GIS data of building footprints and the archetypes representative of Dutch residential buildings, to develop a series of bottom-up building stock models to track future material stock and flows, energy demand, electricity generation, and GHG emissions. Results demonstrate the great potential for decarbonizing the Dutch residential building sector, while decarbonization strategies should be effectively and extensively implemented. Saving space heating energy consumption is the most direct way to reduce annual GHG emissions. Considering that most existing residential buildings will still be in use in 2050, renovating them with high energy performance standards is required. Despite the great potential of renovation, it alone is not enough to realize the climate-neutral target in the residential building stock because the upstream fossil fuel-based energy systems still emit large amounts of GHG. Replacing fossil fuels with renewable energy sources is a critical path, mainly involving onsite natural gas combustion for space heating and offsite natural gas and coal combustion for electricity and heat (in heat networks) generation. Urban mining cannot contribute to as much GHG emission reduction as energy transition strategies, though, should still be implemented as it can reduce the primary material consumption and CDW landfill. In addition to the technical aspects considered in this thesis, it is also necessary to develop feasible policies in terms of socioeconomic aspects to guarantee the effective and quick deployment of these technical strategies. Show less
This thesis examines the impacts and challenges of water use of electric power system. This thesis found that there are large differences in water use of electricity technologies, with hydropower... Show moreThis thesis examines the impacts and challenges of water use of electric power system. This thesis found that there are large differences in water use of electricity technologies, with hydropower and thermal power being two large water users. Water is used for power production and then virtually transmitted via power transmission networks. From this angle, regional water stress can be influenced by power transmission across regions. The power system has further impacts on freshwater biodiversity because of its freshwater consumption and thermal emissions. Power system faces challenges when its water demand cannot be met. Carbon capture and storage is an important approach to reducing carbon emissions of power plants, while it requires additional water resources and could exacerbate the vulnerability of power system to water stress. It is necessary to deepen the analyses of the links between energy and water systems and incorporate the results into future energy and water management. Show less
This book honours Prof Bob Wishitemi. Commemorating his death in 2021, this book includes articles by his former colleagues and other scientists who worked with him over the years. The volume... Show moreThis book honours Prof Bob Wishitemi. Commemorating his death in 2021, this book includes articles by his former colleagues and other scientists who worked with him over the years. The volume contains 12 articles and presents a variety of approaches to address the major challenges facing sustainable tourism in sub-Saharan Africa: climate change and biodiversity loss. Show less
The global agri-food system plays a critical role in food security and environmental issues. Increasing globalization has resulted in a complex international food system where production and... Show moreThe global agri-food system plays a critical role in food security and environmental issues. Increasing globalization has resulted in a complex international food system where production and consumption along the international supply chain can incorporate many geographically distinct regions. This interconnection means that it is difficult for any single producer or consumer to address these impacts. This thesis represents a step towards mapping the global food system from producers to consumers and offers several policy-relevant insights, especially in the national accounting of environmental footprints. Given that many drivers occur locally, but are traded globally, and that inter-regional differences in consumption are increasingly important, it is a natural next step to find approaches that can connect local impacts (production side) with global consumption (consumption side) through trade.Global spatially explicit multi-regional input-output (SMRIO) analyses can help identify hotspots of local production and associated social and environmental impacts driven by global consumption. In this thesis, I assess the use of SMRIO in the past and build a SMRIO model in three different case studies to assess its use. I use SMRIO models to investigate three critical issues (i.e. food security, biodiversity loss, and climate change) in the agri-food system.These sorts of assessments can help provide insights into how we might avoid catastrophic environmental problems in a globalized world. However, any of the benefits highlighted in these studies will require significant international action and collaboration. They will have to be sensitive to local conditions and the economic ramifications of rapid food transitions. Show less
This study has examined traditional coping systems, emerging adaptation strategies and barriers to the adoption of these strategies. Structured questionnaires on coping and adaptation strategies... Show moreThis study has examined traditional coping systems, emerging adaptation strategies and barriers to the adoption of these strategies. Structured questionnaires on coping and adaptation strategies were conducted among Nyangatom households, expounded by focus group discussions and key informant interviews. Correlations between times series (1987–2016) on rainfall, temperature and the local perceptions on CC were examined. The time series analysis confirmed pastoralists' perception that the frequency of extreme drought has increased since 1987. The Nyangatom responded by temporal migration and herd diversification. Other responses include flood cultivation and enhancing alliance formation with other ethnic groups. Multi-nominal logistic regression analyses indicated that age of household head (−), livestock ownership (+), crop productivity (+), off-farm income (+) and access to climate information (+) proved to be key determinants with a statistically significant (negative or positive) effect on adoption. Other factors that hindered climate change adaption include intermittent conflicts with neighbouring ethnic groups and limited access to alternative livelihood options. Interventions to facilitate transition towards sustainable, adaptation-based communities need to incorporate deliberate, longer-term, risk-reducing strategies, including rangeland management, water harvesting and small scale-irrigation schemes. Improved education access, extension services, and a conducive pastoral policy environment will help to enhance the Nyangatom adaptive capacity. Show less
International environmental treaties and soft law instruments stress international cooperation as a fundamental principle in the governance of natural resources shared by two or more states.... Show moreInternational environmental treaties and soft law instruments stress international cooperation as a fundamental principle in the governance of natural resources shared by two or more states. However, tensions between national interests and the common interests of the states sharing natural resources can make it difficult for states to cooperate. Meanwhile, the sustainable management of the resource in question and the human rights of the populations involved can be affected. This dissertation examines principles of international law applicable to the governance of resources that are significant to the world’s population, that have the potential to be a source of conflict, and whose governance presents problematic aspects. The selected principles are sovereignty, community of interests, common concern of humankind, public participation and sustainable development. The first two chapters focus on transboundary freshwater resources, underground and surface waters respectively. Chapter 3 and Chapter 4 focus on the atmosphere, addressing atmospheric degradation and climate change respectively. Chapter 5 focuses on marine resources beyond national jurisdiction or ‘ocean global commons’. Each chapter identifies problems concerning the selected principles and their application to shared resource governance, puts forward original and cogent arguments to address said problems, and suggests ways in which the principles could contribute to the sustainable governance of shared natural resources. Show less
Woolly mammoth fossils on an island where the species eventually dies out, human and animal fossils on the bottom of the North Sea, remains of Siberian unicorns and exceptionally well-preserved... Show moreWoolly mammoth fossils on an island where the species eventually dies out, human and animal fossils on the bottom of the North Sea, remains of Siberian unicorns and exceptionally well-preserved bones from 300,000 years ago from the famous Schöningen archaeological site in Germany: these are the main topics discussed in this thesis.In this dissertation, a vast amount of isotope (d13C and d15N) data from bulk collagen of Quaternary mammalian fossils are presented and discussed. Most of these data are measured at the Centre for Isotope Research (CIO), Groningen (n > 400). The dataset consists of samples from various localities within Eurasia and are taken from human fossils, but mainly from fossils of various animal taxa including extinct species. Many of these faunal species belong to the typical ‘Mammoth steppe fauna’.The results shed light on dietary and habitat characteristics of these animals and hominins through time and space, often during episodes of dramatic climate change. Overall, this thesis, a study of stable isotope data from mammalian fossils, contributes to our understanding of ecological conditions during the Pleistocene / Early Holocene in Eurasia. Show less
Environmental degradation in combination with other factors, can lead to forced migration. This multi-causal and complex phenomenon is hard to capture under international law. The protection of... Show moreEnvironmental degradation in combination with other factors, can lead to forced migration. This multi-causal and complex phenomenon is hard to capture under international law. The protection of environmental refugees can be approached as a human rights, security and State responsibility issue. Each approach provides different legal protection regimes, which addresses different actors. The approaches also cover different periods in time and address different types of environmental refugees. In this thesis, current legal regimes are interpreted in the context of environmentally forced migration. Also new protection possibilities are identified through the combined application of international law regimes. Show less
The coexistence of different species of large herbivores (ungulates) in grasslands and savannas has fascinated ecologists for decades. However, changes in climate, land‐use and trophic structure of... Show moreThe coexistence of different species of large herbivores (ungulates) in grasslands and savannas has fascinated ecologists for decades. However, changes in climate, land‐use and trophic structure of ecosystems increasingly jeopardise the persistence of such diverse assemblages. Body size has been used successfully to explain ungulate niche differentiation with regard to food requirements and predation sensitivity. But this single trait axis insufficiently captures interspecific differences in water requirements and thermoregulatory capacity and thus sensitivity to climate change. Here, we develop a two‐dimensional trait space of body size and minimum dung moisture content that characterises the combined food and water requirements of large herbivores. From this, we predict that increased spatial homogeneity in water availability in drylands reduces the number of ungulate species that will coexist. But we also predict that extreme droughts will cause the larger, water‐dependent grazers as wildebeest, zebra and buffalo–dominant species in savanna ecosystems – to be replaced by smaller, less water‐dependent species. Subsequently, we explore how other constraints such as predation risk and thermoregulation are connected to this two‐dimensional framework. Our novel framework integrates multiple simultaneous stressors for herbivores and yields an extensive set of testable hypotheses about the expected changes in large herbivore community composition following climate change. Show less
Looking for a global and corrective measure to reduce greenhouse gas emissions from international civil aviation has been facing legal obstacles. These obstacles took the form of conflicts of... Show moreLooking for a global and corrective measure to reduce greenhouse gas emissions from international civil aviation has been facing legal obstacles. These obstacles took the form of conflicts of norms linked to the general challenge of the interactions between international aviation law, climate change law and the law of the European Union. Using evolutionary interpretation of the Chicago Convention in order to reconcile norms of substantive and institutional nature emerged as the best solution. However, this method perpetuates legal uncertainty and poses the general challenge of flexibly and elasticity of the Chicago Convention in response to the climate change challenge. This study examines the above mentioned issues of interactions between legal orders and provides recommendations to restore legal certainty needed to ensure sustainable development of international civil aviation. More specifically, this study reveals the underestimated relevance of the ongoing distinction between the legal regimes of air navigation and international air transport, which is a key legal element in the search for a global and corrective solution to the impact of international civil aviation on climate change. Show less
The rate of climate warming in the Arctic nearly doubles warming in the temperate regions. In the arctic tundra, this warming has already altered vegetation, with strong declines in lichens... Show more The rate of climate warming in the Arctic nearly doubles warming in the temperate regions. In the arctic tundra, this warming has already altered vegetation, with strong declines in lichens and mosses and expansion of shrubs. This process called “the greening of the Arctic” has important consequences for the global nutrient cycling and emission of green-house gases to the atmosphere. Even though, plant community dynamics has been monitored in tundra, the effect of climate warming on belowground fungi remained largely unknown, despite the known key roles that fungi play providing the plants with water and nutrients in nutrient-poor arctic soils. This thesis addresses the effect of climate warming on arctic soil fungal communities by DNA-metabarcoding. Climate warming had a strong effect on fungal community composition leading to a strong decline in diversity of lichenized, moss-associated, and ectomycorrhizal fungi. Instead, many species of saprotrophic and parasitic fungi took over. These changes are expected to alter nutrient turnover in tundra soils (including decomposition and CO2 flux) and affect populations of plants and animals (for example, caribous that are feeding on lichenized fungi in winter). Show less
Van der Horn, Sarah A.; Van Kolfschoten, Thijs; Van der Plicht, Johannes; Hoek, Wim Z. 2015
