Material circularity and energy efficiency are highly relevant and intertwined issues for the transition towards a carbon-neutral and circular built environment. In the Netherlands, the building... Show moreMaterial circularity and energy efficiency are highly relevant and intertwined issues for the transition towards a carbon-neutral and circular built environment. In the Netherlands, the building sector has been rendered a priority towards a circular and low-carbon society. This thesis explored potential solutions for these twin issues in light of a novel technological system. This system presents an energy–material efficiency solution for energy renovation of building stocks with prefabricated concrete elements (PCEs) with recycled CDW as feedstock. Life cycle assessment (LCA) and life cycle costing (LCC) were combined with dynamic material flow analysis (MFA) to estimate the economic and environmental implications at both a product level and a national level. Show less
The rapidly increasing commercial application of metallic nanoparticles within products will inevitably enhance the amount of NPs being released into soil. Assessment of the impact of metallic... Show moreThe rapidly increasing commercial application of metallic nanoparticles within products will inevitably enhance the amount of NPs being released into soil. Assessment of the impact of metallic nanoparticles (NPs) in soil ecosystems is a necessity for ensuring their safe and sustainable application. In this thesis, we integrated exposure routes and exposure dynamics of NPs to investigate the uptake, translocation and impacts of metallic NPs in plants upon long-term exposure. We furthermore investigated the long-term impacts of NPs on the rhizosphere soil bacterial community and the potential transfer and biomagnification within the lettuce - terrestrial snails food chain. Our results demonstrate that 1) root exposure induced more phytotoxicity than foliar exposure at equal exposure concentrations; 2) the phytotoxicity and accumulation of AgNPs in plants was shape- and size-dependent; 3) nanoparticulate Ag present in AgNPs suspensions that predominantly drive their impacts on green leafy plants; 4) the dissolution of AgNPs in soil is the dominant process influencing Ag uptake and translocation in lettuce; 5) long-term exposure to high concentrations of AgNPs altered the structure and composition of rhizosphere bacterial community; 6) NPs can be transferred from lettuce leaves to snails, as associated with increased potential risks to higher trophic level organisms. Show less
The role of material production as a driver of environmental impacts is increasing, which calls for a better understanding of global material flows. This thesis explores the role of in-use stocks... Show moreThe role of material production as a driver of environmental impacts is increasing, which calls for a better understanding of global material flows. This thesis explores the role of in-use stocks of products, buildings and infrastructure as a key driver of global material demand and discusses the implications with regards to availability of waste flows. The method based on detailed product compositions and lifetimes is applied to generate material use scenario’s towards 2050 for appliances, vehicles, buildings and electricity infrastructure. Under most of the developed scenarios, a growing population and increasing affluence are expected to lead to higher demand for products, and consequentially leads to a continued growth in annual material demand worldwide. While the results can be used to identify sector specific challenges and opportunities for achieving a more circular economy, the method also provides a starting point to incorporate material cycles and resource efficiency strategies more explicitly and consistently in integrated assessment models. This would allow for a more comprehensive assessment of resource use in relation to other global challenges such as climate change. Show less
Freshwater and brackish water ecosystems are arguably the most vulnerable ecosystems on earth, due to concentrated human developments in and around them. The Pontocaspian (PC) region located at the... Show moreFreshwater and brackish water ecosystems are arguably the most vulnerable ecosystems on earth, due to concentrated human developments in and around them. The Pontocaspian (PC) region located at the border of Europe and Asia contains a variety of brackish water ecosystems and unique inhabitants, known as the PC biota. The current status and trends in PC biodiversity are poorly known, however, deterioration of PC habitats is evident in the Black Sea and Caspian Sea Basins. This thesis aims to support an establishment of effective PC biodiversity conservation regime. I use the Black Sea Basin as a study system and outline current status and trends in PC biodiversity and assess the direct and indirect anthropogenic drivers of the PC biodiversity change. I show that PC biodiversity is severely declining as a result of human action. Identified direct drivers of decline include damming of rivers; habitat modifications; pollution and eutrophication; invasive alien species and climate change. Indirect drivers of PC biodiversity decline include current suboptimal legal arrangements, inadequate institutional design of environmental stakeholder organizations and non-inclusive governance systems, as well as the limited funding availability for PC biodiversity conservation, institutional instability and low recognition of the need for PC biodiversity conservation. Show less
This thesis focuses on the social dimensions of crane and wetland conservation in rural landscapes in Kenya, Uganda and Zimbabwe. The focus is predominantly on the Grey Crowned Crane although one... Show moreThis thesis focuses on the social dimensions of crane and wetland conservation in rural landscapes in Kenya, Uganda and Zimbabwe. The focus is predominantly on the Grey Crowned Crane although one chapter is dedicated to social dimensions of Wattled Crane conservation. Chapter 2 provides an overview of how social factors influence wetland management decision-making, drawing linkages between human actions and ecological changes associated with crane habitat loss. Chapter 3 outlines major human actions that impact Wattled Cranes and their habitats, elaborating the underlying social causations behind the actions. Chapter 4 draws lessons on the effectiveness of community-led conservation approaches through an evaluation of a community-led project in Kenya. Chapter 5 presents results of an evaluation of the institutional development process and the ensuing environmental conservation impacts at three sites where conservation projects were initiated in 2002 in Uganda. Chapter 6 synthesises key findings, addressing the question of what works for cranes and wetland conservation in rural landscapes in East and Southern Africa. The thesis contributes to an improved understanding of interactions between cranes and rural communities and provides insights into strategic approaches for addressing the decline of cranes within their range in East and Southern Africa. Show less
In-use stocks of products can be considered as intermediaries between human needs and the physical world. During use, they fulfil important functions, but they can also be seen as a source of... Show moreIn-use stocks of products can be considered as intermediaries between human needs and the physical world. During use, they fulfil important functions, but they can also be seen as a source of materials for the future: the production of secondary materials. This idea of an urban mine is applied to copper in China in this dissertation. Taking into account that most modern technologies rely on copper, consumption of diverse copper-containing products in China is increasing rapidly. The in-use copper stocks have become a large reservoir for urban mining. It is of crucial importance to secure future supply by closing copper cycles, thereby also reducing environmental pressure. Therefore, the aim of this research is to explore how the stocks and flows related to the Chinese copper cycle can be transformed into a sustainable and circular economy. The material flow analysis and life cycle assessment approaches are used to quantify the in-use stocks, demand and waste generation for copper under the Chinese policies related to general economic development, the energy transition and ambitions with regard to circular economy, and assess associated environmental impacts as well as identify potential options to realize the dematerialization and environmental sustainability of the copper cycle in China. 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
A sustainable resource management is an essential aspect to satisfy the current human needs without compromising the needs of future generations. There is a need to provide resource-efficient... Show moreA sustainable resource management is an essential aspect to satisfy the current human needs without compromising the needs of future generations. There is a need to provide resource-efficient strategies that enables to decrease the risk of disruptive supply chains while maintaining natural resources for the current and future generations. Within this context, circular economy has been proposed as a paradigm that aims to reduce resource extraction and waste flows by retaining materials into the economy. However, there is still a lack of understanding on how a global circularity transition might look like, and what would be the magnitude of the potential economic, social, and environmental implications of material circularity on macro scale. These aspects raise the questions: Is circular economy a sustainable solution to achieve a global economic and environmental sustainability? And what are the macroeconomic, social, and environmental implications of a transition to a circular economy? A macro level assessment of material circularity aims to understand how material circularity could contribute to sustainable resource management, and explore which circularity interventions could support a cost-effective circularity transition on a macro scale. Show less
