Climate change is causing shifts in the phenology (timing of life events) of many organisms with consequences such as changes in species interactions and community composition. Owing to the large elevational and latitudinal gradients in its distribution, the native California wildflower, Streptanthus tortuosus (shieldplant) is a great model organism for studying the impacts of climate change. Few studies have looked at temporal shifts in the onset, peak, and end of flowering. Herbarium specimens and local historical climate data were used to make inferences about the temporal shifts of flowering phenology and the impacts of rising mean annual temperature and minimum monthly temperature on flowering phenology. Across the 114 years (1894- 2010) sampled, low elevation specimens (up to 1000 m) were the most sensitive to phenological shifts with their peak flowering advancing by 19 days. The end of flowering in low elevation plants advanced by 17 days. Furthermore, the data demonstrate that increasing temperatures correlated with earlier flowering times for all specimens, particularly at low elevations. Plants at higher elevations displayed smaller shifts in flowering timings. Taken together, these results suggest that climate change is likely causing shifts in the reproductive phenology of S. tortuosus. Understanding these impacts will enable us to better understand and predict the plant’s ability to adapt and persist in California as it faces new and increasingly variable environmental conditions in the future.

The Texas High Plains produces the most substantial amount of cotton in Texas. The region is a semi-arid area with limited precipitation, and it is, therefore, susceptible to climate change. Cotton production in the Texas High Plains is mostly dependent on irrigation to increase yield. The overall goal of this research was to study the interrelationships between climate change and cotton yield using correlation analysis and also to study how climate has changed in the region using trend analysis. A three-decade data (1987-2017) was analyzed to establish the relationship between climate change and cotton and also to determine how climate has changed in the area over the last 30 years. The research used precipitation and temperature data to assess climate change.The results of this research showed that annual mean temperature has lesser impacts on cotton yield, and the correlation between annual precipitation and cotton yield is insignificant. It also found out that high rates of temperature at the boll opening stage of cotton growth results in decreased cotton yield and that at the boll development and boll opening stages, precipitation is needed. Again, the research indicated that, on average, there had been a significant increase in temperature, but precipitation trends are insignificant. About 60% of cotton acreage in the area is irrigated. Therefore the research also found out that increasing trends of cotton yield may contribute to the decline of groundwater in the area.

Thesis (Ph.D.)--Boston University / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / Whether a species will flourish or face extinction under a new climate regime is largely determined by its dispersal ability, its adaptive capacity or some combination of these processes. These processes have also played important roles in the evolutionary histories of species, ultimately shaping their contemporary distributions. In terrestrial studies, a landscape genetics approach is often used to explain how geographic, ecological and evolutionary processes interact to structure spatial genetic variation across populations, but these approaches have only begun to be used in marine ecosystems. This dissertation fills an emerging niche in marine ecology by taking an interdisciplinary seascape genetics approach to investigating the interplay of climate, dispersal and adaptation as shallow-water marine fishes respond to environmental heterogeneity over space and climatological shifts over time. [TRUNCATED] / 2999-01-02

Master of Science / Department of Communications and Agricultural Education / Lauri M. Baker / The purpose of this study was to explore the frames and messages, issue salience, and communication preferences agricultural producers in Kansas, Oklahoma, and Texas use and accept related to climate change and the impacts of a changing climate. It was of additional interest to explore the climate-change beliefs and preferred agricultural media sources for climate and climate change information. Specific research objectives to guide the study were RO1: describe the level of issue salience agricultural producers have related to climate change; RO2: investigate frames and messages agricultural producers prefer in reference to the scientifically designated phenomena of climate change and impacts; and RO3: identify the agricultural media and information channels agricultural producers use for climate change. Based on findings in previous research, one hypothesis was developed: H1: agricultural producers in the Southern Plains Regional Climate Hub area will be located within the audience segment groups of the concerned and the cautious as identified in the Six America’s (2012) study. An Internet survey was distributed to producers in Kansas, which was open from March 3 to March 14, 2016, with 158 responses to the survey. Agenda-Setting Theory served as the basis for the study including the tenants of issue salience and framing in relation to climate change. The study found that the majority (n = 158, 64.92%) of producers believed that climate change was occurring, however, the causes were still contested. The study identified that higher levels of risk perception and education level were linked to belief in anthropogenic climate change (ACC). Primarily, the study found that loss framing was most effective in communicating the impacts of climate change. Terminology and distance framing were less important in message framing. Regional and university publications were cited most frequently by producers as sources of climate and climate-change information and overall use of agricultural media publications was linked to higher levels of belief in ACC. Users of business reports and TV had the highest mean climate-change belief; non-users had the lowest. Audience segments aligned with cautious and concerned Six America’s (2013) audience segment group, which indicated a shift towards accepting climate change among agricultural producers.

<p>Climate change is thought to be one of the most pressing environmental problems facing humanity. However, due in part to failures in political communication and how the issue has been historically defined in American politics, discussions of climate change remain gridlocked and polarized. In this dissertation, I explore how climate change has been historically constructed as a political issue, how conflicts between climate advocates and skeptics have been communicated, and what effects polarization has had on political communication, particularly on the communication of climate change to skeptical audiences. I use a variety of methodological tools to consider these questions, including evolutionary frame analysis, which uses textual data to show how issues are framed and constructed over time; Kullback-Leibler divergence content analysis, which allows for comparison of advocate and skeptical framing over time; and experimental framing methods to test how audiences react to and process different presentations of climate change. I identify six major portrayals of climate change from 1988 to 2012, but find that no single construction of the issue has dominated the public discourse defining the problem. In addition, the construction of climate change may be associated with changes in public political sentiment, such as greater pessimism about climate action when the electorate becomes more conservative. As the issue of climate change has become more polarized in American politics, one proposed causal pathway for the observed polarization is that advocate and skeptic framing of climate change focuses on different facets of the issue and ignores rival arguments, a practice known as “talking past.” However, I find no evidence of increased talking past in 25 years of popular newsmedia reporting on the issue, suggesting both that talking past has not driven public polarization or that polarization is occurring in venues outside of the mainstream public discourse, such as blogs. To examine how polarization affects political communication on climate change, I test the cognitive processing of a variety of messages and sources that promote action against climate change among Republican individuals. Rather than identifying frames that are powerful enough to overcome polarization, I find that Republicans exhibit telltale signs of motivated skepticism on the issue, that is, they reject framing that runs counter to their party line and political identity. This result suggests that polarization constrains political communication on polarized issues, overshadowing traditional message and source effects of framing and increasing the difficulty communicators experience in reaching skeptical audiences.</p> / Dissertation

Almost twenty years after the signing of the United Nations Framework Convention on Climate Change and negotiations over mitigation and adaptation strategies to reduce greenhouse gas emissions began, the negotiations continue to fall short of scientific goals to curb warming. Current UNFCCC procedures do not provide for mediation in the process of negotiations. Public policy mediation has been used often at local, national, and regional levels to resolve environmental disputes. The characteristics of the climate change negotiations suggest that mediation may provide a number of benefits to the negotiations. Scholars and practitioners have developed criteria for determining the suitability of applying mediation to a dispute. The UNFCCC negotiations meet the majority of these criteria. However, the urgency of the issue, its complexity, the number of stakeholders, institutional capacity, and the power parity of the parties suggest mediation may be most beneficial if applied on a small scale at the UNFCCC negotiations. / 10000-01-01

Magister Artium (Development Studies) - MA(DVS) / Climate change has induced a number of environmental issues that have affected people's lives beyond the scope of ecology; these effects have touched on the social, cultural and economic dimensions of life as well. In light of this, migration has increasingly been used as a climate adaptation strategy particularly in rural areas. This has not only changed migration patterns, it has also reconstructed the gender dynamics within the migration discourse through the ‘feminization of migration.’ Hence it has become important to analyse, understand and unpack the various ways in which women experience climate change and climate-induced migration, and how this has affected their lives. Additionally, women's position as active agents in climate migration and knowledge production has increasingly been acknowledged in climate and migration discourse This study focused on the effects of climate change on female migration patterns in Goromonzi District, Zimbabwe; and took place in Hiya village. The main research question aimed to find out if using migration as an adaptation strategy to climate change had positively changed the lives of women in rural Zimbabwe? With a focus on Hiya village in Goromonzi, Zimbabwe the research question was answered through identifying migration push factors for women, climate resistant livelihoods and the benefits of migration in light of climate induced environmental disasters. A mixed methods research approach was used however the research is largely qualitative.

abstract: Infrastructure are increasingly being recognized as too rigid to quickly adapt to a changing climate and a non-stationary future. This rigidness poses risks to and impacts on infrastructure service delivery and public welfare. Adaptivity in infrastructure is critical for managing uncertainties to continue providing services, yet little is known about how infrastructure can be made more agile and flexible towards improved adaptive capacity. A literature review identified approximately fifty examples of novel infrastructure and technologies which support adaptivity through one or more of ten theoretical competencies of adaptive infrastructure. From these examples emerged several infrastructure forms and possible strategies for adaptivity, including smart technologies, combined centralized/decentralized organizational structures, and renewable electricity generation. With institutional and cultural support, such novel structures and systems have the potential to transform infrastructure provision and management. / Dissertation/Thesis / Masters Thesis Civil, Environmental and Sustainable Engineering 2018

abstract: Small-scale, peasant farmers are some of the most vulnerable people to the effects of climate change. They rely on a stable climate to support their natural ways of farming, which typically depends on consistent rainfall, temperate weather, and predictable season cycles. The perceptions of how successful coffee production is during shifting climatic disruptions is of key importance, if mitigation or adaptation efforts are to be successfully implemented. By using ethnographic methods with members of a coffee cooperative in Mexico, called Cafe Justo, I found that peasant farmers are very perceptive of the climatic changes and recognize forthcoming challenges as a result of changes in weather and precipitation levels. Rain-fed agriculture remains particularly vulnerable to coffee market demands, as coffee production for the majority of the cooperative members is the primary source of income. Through interpretive analysis of in-depth interview data collected from 19 coffee-famers in Chiapas, Mexico, I identified factors associated with perceptions of changing climate and weather conditions. Social identities, general perceptions of climate change, and impacts on livelihoods were investigated through the speaking-with model, as it was presented by Nagar and Geiger in 2007. These findings have rich implications for co-learning between the small-scale, coffee farmers and the scientific community so that mitigation and adaptation strategies are discussed. The findings also merit further investigation into future migration changes due to mass exoduses of climate refugees who are no longer able to successfully cultivate and harvest the lands to serve their needs and those of their community. / Dissertation/Thesis / Masters Thesis Social Justice and Human Rights 2018

abstract: Climate change impacts are evident throughout the world, particularly in the low lying coastal areas. The multidimensional nature and cross-scale impacts of climate change require a concerted effort from different organizations operating at multiple levels of governance. The efficiency and effectiveness of the adaptation actions of these organizations rely on the problem framings, network structure, and power dynamics of the organizations and the challenges they encounter. Nevertheless, knowledge on how organizations within multi-level governance arrangements frame vulnerability, how the adaptation governance structure shapes their roles, how power dynamics affect the governance process, and how barriers emerge in adaptation governance as a result of multi-level interactions is limited. In this dissertation research, a multilevel governance perspective has been adopted to address these knowledge gaps through a case study of flood risk management in coastal Bangladesh. Key-informant interviews, systematic literature review, spatial multi-criteria decision analysis, social network analysis (SNA), and content analysis techniques have been used to collect and analyze data. This research finds that the organizations involved in adaptation governance generally have aligned framings of vulnerability, irrespective of the level at which they are operated, thus facilitating adaptation decision-making. However, this alignment raises concerns of a neglect of socio-economic aspects of vulnerability, potentially undermining adaptation initiatives. This study further finds that the adaptation governance process is elite-pluralistic in nature, but has a coexistence of top-down and bottom-up processes in different phases of adaptation actions. The analysis of power dynamics discloses the dominance of a few national level organizations in the adaptation governance process in Bangladesh. Lastly, four mechanisms have been found that can explain how organizational culture, practices, and preferences dictate the emergence of barriers in the adaptation governance process. This dissertation research overall advances our understanding on the significance of multilevel governance approach in climate change adaptation governance. / Dissertation/Thesis / Doctoral Dissertation Geography 2019