<p> The geographic variability and uneven distribution of climate-related impacts in urban environments pose serious challenges to achieving social-ecological resilience and environmental justice. There are no generalizable solutions for the anticipated climate challenges facing urban environments, which vary from increased frequency and intensity of extreme weather events to flooding, heat waves, droughts, and worsening air quality. Densely populated coastal urban areas, like Long Beach, California, are further exposed to sea level rise, coastal erosion, and saltwater intrusion. In response, ecosystem-based adaptation plans have gained traction in the scientific literature and policy circles as viable, multi-beneficial strategies to build urban resilience to withstand anticipated climate threats. Green infrastructure (GI) offers flexible, place-based solutions and as such, has surged in popularity as an urban planning strategy, reflecting the focus of planners and policy-makers to design and implement location-specific interventions. Utilizing a mixed-methods approach, this empirical case study analyzes the spatial distribution and projected intensity of climate-related impacts in Long Beach, California. Integrating geospatial data, surveys, and key informant interviews, this study explores citizen perception of climate risk and desirability of GI solutions to increase adaptive capacity across two high risk communities with unevenly distributed biophysical and social vulnerabilities.</p><p>

Despite looming ecological disaster, a persistent state of insufficient action seems commonplace amongst most organizations. This thesis critically explores how this impasse is constituted by discursive struggles surrounding the global ecological crisis. These struggles are situated within the context of global environmental governance – a power arena that has, over the past 25 years, become a defining battleground regarding environmental sustainability. Here, discourses of the ecological crisis are constituted by political contests amongst, most notably, multinational corporations, civil society organizations, and (trans)national policy actors. This thesis draws mainly from post-structural discourse theory, coupled with critical perspectives on organizations and the natural environment, to explore both the discursive practices that fix meanings surrounding the global ecological crisis, and the power effects thereof. The primary source of data is text – this study is explicitly interested in how discourses of the global ecological crisis evolve as the natural environment is (mis)represented in organizational disclosures. Despite recognition by management and organization scholars that the natural environment is indeed constructed, a functional separation between business and nature persists, the relationship of which is mostly examined from a firm-centric perspective. However, sustainability issues such as climate change transcend the confines of firm activity and operate across spatial and temporal dimensions. Hence, there is an urgent need to reconsider the business-nature dualism. To do so, this study adopts a multi-level, multi-method approach that permits a necessary degree of analytical and theoretical flexibility. The four individual articles that encompass this work, whilst drawing from different theoretical approaches, along with focusing on different levels of analysis, are underpinned by the contentious intersection between discourse, organizations and the natural environment. The first article concerns ‘macro talk’ and, operating on the field level, explores how a dominant understanding of business’ role in sustainable development is constituted during the UN Earth Summits in 1992, 2002, and 2012. The second article regards ‘corporate talk’ and, this time on an organizational level, examines how tensions between economic growth and environmental protection are avoided by the European oil and gas supermajors—BP, Shell and Total—through the practice of mythmaking. The third article takes a longitudinal approach and, also concerning ‘corporate talk’, examines how BP rearticulated a hegemonic discourse of fossil fuels, which, when enacted, reproduces corporate inaction on climate change. Finally, the fourth article emphasizes ‘resistance talk’, focusing on how climate activists, as part of the global fossil fuel divestment movement, engage in certain micro-level practices as they attempt to stigmatize the fossil fuel industry. In all, the findings from these articles suggest that organizations both represent nature as something to be conquered, dominated, and valued economically and as a pristine wilderness to be preserved for the enjoyment of future generations. In pursuing these two extremes concurrently, organizations self-perpetuate a social-symbolic deadlock that hinders finding sustainable ways for human systems to coexist with natural systems. This thesis contributes mainly to literature on organizations and the natural environment by illustrating how certain practices, mechanisms, and processes continuously redefine the business-nature relationship by facilitating a discursive struggle across multiple spatial and temporal dimensions. In doing so, there are implications both for policy and business organizations, which are discussed in the concluding chapter of this work.

A 147cm sediment core from Lake DV09, northern Devon Island, Nunavut, Canada (75&deg; 34'34"N, 89&deg; 18'55"W) contains annually-laminated (varved) sediments, providing a 1600-year record of climate variability. A minerogenic lamina deposited during the annual thaw period and a thin deposit of organic matter deposited during the summer and through the winter, together form a clastic-organic couplet each year. The thinnest varves occur from AD800-1050, and the thickest from AD1100-1300, during the Medieval Warm Period. The relative sediment density is also highest during this period suggesting increased sediment transport energy. The coldest period of the Little Ice Age appears to be during the AD 1600s. Varve widths over the past century indicate climate warming in the region.

<p> The assumption of hydrologic stationarity has formed the basis of coastal design to date. At the beginning of the 21^st century, the impact of climate variability and future climate change on coastal water levels has become apparent through long term tide gauge records, and anecdotal evidence of increased nuisance tidal flooding in coastal areas. Recorded impacts of global sea rise on coastal water levels have been documented over the past 100 to 150 years, and future water levels will continue to change at increasing, unknown rates, resulting in the need to consider the impacts of these changes on past coastal design assumptions. New coastal infrastructure plans, and designs should recognize the paradigm shift in assumptions from hydrologic stationarity to non-stationarity in coastal water levels. As we transition into the new paradigm, there is a significant knowledge gap which must address built coastal infrastructure vulnerability based on the realization that the underlying design assumptions may be invalid. </p><p> A framework for the evaluation of existing coastal infrastructure is proposed to effectively assess vulnerability. The framework, called the Climate Preparedness and Resilience Register (CPRR) provides the technical basis for assessing existing and future performance. The CPRR framework consists of four major elements: (1) datum adjustment, (2) coastal water levels, (3) scenario projections and (4) performance thresholds. The CPRR framework defines methodologies which: (1) adjust for non-stationarity in coastal water levels and correctly make projections under multiple scenarios; (2) account for past and future tidal to geodetic datum adjustments; and (3) evaluate past and future design performance by applying performance models to determine the performance thresholds. The framework results are reproducible and applicable to a wide range of coastal infrastructure types in diverse geographic areas. </p><p> The framework was applied in two case studies of coastal infrastructure on the east and west coasts of the United States. The east coast case study on the Stamford Hurricane Barrier (SHB) at Stamford CT, investigated the navigation gate closures of the SHB project. The framework was successfully applied using two performance models based on function and reliability to determine the future time frame at which relative sea level rise (RSLR) would cause Navigation Gate closures to occur once per week on average or 52 per year. The closure time analysis also showed the impact of closing the gate earlier to manage internal drainage to the Harbor area behind the Stamford Hurricane Barrier. These analyses were made for three future sea level change (SLC) scenarios. </p><p> The west coast case study evaluated four infrastructure elements at the San Francisco Waterfront, one building and three transportation elements. The CPRR framework applied two performance models based on elevation and reliability to assess the vulnerability to flooding under four SLC scenarios. An elevation-based performance model determined a time horizon for flood impacts for king tides, 10 and 100-year annual exceedance events. The reliability-based performance model provided a refinement of results obtained in the elevation-based model due to the addition of uncertainty to the four infrastructure elements. </p><p> The CPRR framework and associated methodologies were successfully applied to assess the vulnerability of two coastal infrastructure types and functions in geographically diverse areas on the east and west coasts of the United States.</p><p>

This study has made use of an experimental method to investigate if and how exposure to an integrated 'socioeconomic- and climate justice' framing, and a 'catastrophe' framing, alter Swedish post highschool students attitudes towards climate change mitigation efforts, both on a personal- and societal level. The experiment was conducted through 287 surveys where equal shares of the respondents were given different stimuli through a short text at the beginning of the surveys. Results indicate that contrary to the hypotheses, exposure to the 'catastrophe' frame had a larger and more positive effect on especially attitudes towards personal climate change mitigation efforts, but also to some extent on societal efforts, than did exposure to a 'justice' framing. This is possibly due to the salience of catastrophe framings in the Swedish public discourse, and /or the integrated approach the educational system has taken on the subject of sustainable development.

<p> Animal movement influences ecological and biogeographical dynamics, and studying it reveals helpful insights at a time when anthropogenic activities have accelerated rates of climatic and land cover change. This dissertation addresses three fundamental questions in ecology and biogeography linked to the movement and distribution of animals. First, how do animal movements affect their environments? Second, how do the effects of land use change interact with atmospheric climate change to alter species distributions? Third, how do organisms track their climatic niches through time and space? Each question is addressed with a separate study, each generating methods and results with implications for future academic work, management, and conservation. </p><p> In the first study, I tracked the daily movements of the common hippopotamus, <i> Hippopotamus amphibius</i>, a megaherbivore that transports nutrient-rich biomass between terrestrial and aquatic ecosystems. I developed a spatially explicit biomass transfer model that relates rates of ingestion and egestion to movement behavior states derived from the movement data. The biomass transfer model revealed the process by which <i>H. amphibius</i> generates patterned landscapes of nutrient removal and deposition hotspots. In addition, the model generated maps of these nutrient transfer landscapes, making it possible to explore the spatial dynamics of nutrient transfers, and showing that the amount of biomass transferred reaches levels equivalent to rates of aboveground net primary productivity. In addition to revealing the influences of <i>H. amphibius</i> on ecosystem ecology, this study also provided metrics of home range size, habitat use, and movement behavior useful for conservation planning. </p><p> The first study provides a method for nutrient transfer mapping which could be applied to many other species, and leverages increasing quantities of high-resolution movement tracking data to map transfers of nutrients across landscapes. This can help predict the landscape-scale ecological changes resulting from the loss of animal movements that provide nutrient transfers. The approach can also be used to map other material transport dynamics, such as animal-transported seed dispersal or the movement of persistent organic pollutants. </p><p> In the second study, I used species distribution modeling to identify the interacting effects of climate and land use change on the distribution of <i>H. amphibius</i>. Hydrologic change is likely to result from ongoing shifts from rain-fed to irrigated agriculture across much of sub-Saharan Africa, where <i>H. amphibius</i> occurs. A lack of spatial data on hydrology, especially data temporally consistent with atmospheric climate datasets, has made it difficult to build species distribution models for semiaquatic species, such as <i>H. amphibius</i>, which are physiologically dependent on surface water. I overcame this challenge by coupling a simple hydrologic model to scenarios of land use and climate change, identifying potential effects on <i>H. amphibius</i> distributions. I found that increased levels of streamflow abstraction from irrigation will lead to much greater declines in <i>H. amphibius</i> habitat suitability than arise from scenarios of climate change alone. I also contrasted predictions of <i>H. amphibius</i> distributions that incorporated only atmospheric climate variables to predictions that also incorporated hydrologic variables, and found significant improvements in model performance when hydrology was incorporated. </p><p> The second study provides support for using predictive variables with strong mechanistic links to the physiology or ecology of the focal species when building species distribution models. The study also outlines a way to generate surfaces of key hydrologic variables from the climate surfaces commonly used for species distribution modeling. These surfaces have the potential to greatly improve forecasts generated by other semiaquatic species distribution models. From a conservation perspective, the second study highlights the potential for substantial losses of <i>H. amphibius</i> habitat across Africa as a result of increases in irrigation development. Other semiaquatic species in the region, as well as those dependent on the keystone ecological role of <i>H. amphibius</i> and its nutrient-transporting movements, may be similarly affected. </p><p> In the third study, I explored the role of movement in shaping species distributions in variable climates. Climatic variability at multiple time scales causes suitable climatic conditions to shift across geographic space. Recent scholarship has proposed that two species traits, the ability to colonize suitable locations, referred to as dispersal, and the ability to continue to occupy an area with unsuitable conditions, referred to as persistence, facilitate niche tracking, the process by which species follow suitable conditions moving through geographic space. By developing a model that simulates niche tracking through historically observed patterns of temporal and spatial variability, I quantified how different dispersal and persistence abilities affect niche tracking potential. I found that both dispersal and persistence facilitate niche tracking, and that small increases in persistence ability result in surprisingly large increases in niche tracking potential. </p><p> The third study makes two main contributions to ecological niche theory and distribution modeling. (Abstract shortened by ProQuest.) </p><p>

<p> The Interior Alaska boreal forest ecosystem is one of the largest ecosystems on earth and lies between the warmer southerly temperate and colder Arctic regions. The ecosystem is underlain by discontinuous permafrost. The presence or absence of permafrost primarily controls water pathways and ecosystem composition. As a result, the region hosts two distinct ecotypes that transition over a very short spatial scale&mdash;often on the order of meters. Accurate mesoscale hydrological modeling of the region is critical as the region is experiencing unprecedented ecological and hydrological changes that have regional and global implications. However, accurate representation of the landscape heterogeneity and mesoscale hydrological processes has remained a big challenge. This study addressed this challenge by developing a simple landscape model from the hill-slope studies and in situ measurements over the past several decades. The new approach improves the mesoscale prediction of several hydrological processes including streamflow and evapotranspiration (ET). </p><p> The impact of climate induced landscape change under a changing climate is also investigated. In the projected climate scenario, Interior Alaska is projected to undergo a major landscape shift including transitioning from a coniferous-dominated to deciduous-dominated ecosystem and from discontinuous permafrost to either a sporadic or isolated permafrost region. This major landscape shift is predicted to have a larger and complex impact in the predicted runoff, evapotranspiration, and moisture deficit (precipitation minus evapotranspiration). Overall, a large increase in runoff, evapotranspiration, and moisture deficit is predicted under future climate. Most hydrological climate change impact studies do not usually include the projected change in landscape into the model. In this study, we found that ignoring the projected ecosystem change could lead to an inaccurate conclusion. Hence climate induced vegetation and permafrost changes must be considered in order to fully account the changes in hydrology.</p><p>

Magister Artium (Development Studies) - MA(DVS) / Agriculture in Ghana is dominated by smallholder farmers who are faced with unpredictable rainfall and extreme weather events. Climate modelling forecasts that the rate at which precipitation will decrease in the country is far more than the rate at which it will increase during the wet season. It is predicted that rain-fed maize output will decrease below 25 percent in all the ten regions of the country by 2020 if nothing is done. To mitigate the effect of climate change and safeguard food security, the country must undertake measures to adapt to the changing climate. The process of adaptation, therefore, involves the interdependence of agents through their relation with each other. This includes the institution in which the agents reside and the resource based on which they depend. The resource embedded in such relationship has been termed social capital. Empirical studies on social capital and climate change adaptation is lacking, especially in Ghana. Based on this, the study assesses the influence of social capital on climate change adaptation strategies among smallholder farmers in the Central region of Ghana. Both primary and secondary data were used for the study. Primary data was collected using household questionnaires, focus group discussions, and key informant interviews. K-means cluster analysis was used to identify weak and strong ties and four individual social capital variables. Twenty-year maize and rainfall data were analysed using trend analysis. The influence of individual social capital and other controlled variables were analysed using Multinomial logit model. Using 225 sampled households the results of the study showed that all the four identified individual social capital variables differ by sex. The perceptions of climate change among smallholder farmers also differ significantly by location. The four individual social capital variables as well as other controlled variables influence at least one indigenous adaptation strategy and one introduced adaptation strategy. The study recommends, among others, that transfer of climate change adaptation techniques or technology to smallholder farmers should not be solely accomplished through the usual technology transfer network of agricultural researchers and extension agents. Rather, it will be imperative to increased contact with a wide variety of local actors who provide information and resources for agricultural production.

<p> Solar radiation is a vast, distributed, and renewable energy source which Humanity can utilize via the photovoltaic effect. The goal of photovoltaic technology is to minimize the true costs, while maximizing the power conversion efficiency and lifetime of the cell/module. Interface-related approaches to achieving this goal are explored here, for two technologically-important classes of light absorbers: crystalline-silicon (c-Si) and metal halide perovskite (MHP). The simplest solar cell consists of a light absorber, sandwiched between two metals with dissimilar work functions. Carrier-selective contacts (CSC&rsquo;s), which are ubiquitous in modern solar cells, are added to improve the electrical performance. Solar cells require asymmetric carrier transport within the cell, which can be effected via electrostatic and/or effective fields, and CSC&rsquo;s augment the asymmetry by selectively transporting holes to one contact, and electrons to the other contact. </p><p> The proper design and implementation of a CSC is crucial, as the performance, lifetime, and/or cost reduction of a solar cell can be hampered by a single interface or layer. A framework, consisting of eight core requirements, was developed from first-principles to evaluate the effectiveness of a given CSC. The framework includes some requirements which are well-recognized, such as the need for appropriate band offsets, and some requirements which are not well-recognized at the moment, such as the need for effective valence/conduction band density of states matching between the absorber and CSC.</p><p> The application of the framework to multiple silicon-based and MHP-based CSC&rsquo;s revealed the difficulties of effectively designing and implementing a CSC. A poly(3-hexylthiophene)/c-Si heterojunction was found to be a near ideal hole-selective contact (HSC). Three metal oxide/c-Si heterojunctions initially expected to yield comparable electron-selective contacts (ESC&rsquo;s), titanium dioxide/c-Si (TiO₂/c-Si), zinc oxide/c-Si (ZnO/c-Si), and tin dioxide/c-Si (SnO₂/c-Si), were instead discovered to be widely different. The TiO₂/MHP heterojunction was found to be a moderately ideal ESC, and the nickel oxide/MHP (NiOX/MHP) heterojunction is expected to be a good HSC. If interfacial lead di-iodide (PbI₂) is intentionally or unintentionally deposited at the interfaces of a MHP solar cell, it is expected to be detrimental to the operation of the NiOX/MHP HSC, but not to the TiO₂/MHP ESC.</p><p>

No abstract available. / Dissertation (LLM)--University of Pretoria, 2013. / Centre for Human Rights / unrestricted