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Description
Day-to-day decision makers on agricultural operations play a key role in maintaining both a sustainable and food secure agricultural society. This population, also defined as Principal Producers by the 2017 USDA Agricultural Census Report, has witnessed a significant decline in recent years, raising many questions surrounding why farmers are retiring faster than they can be replaced. To look closely at this phenomenon, this study focuses on the State of Ohio to hear first-hand from producers what they need to be successful through a series of semi-structured interviews. This study also maps recent changes in variables that define this issue from 2007-2017 using QGIS and USDA Agricultural Census data. The findings from this study show the recent decline of mid-sized agricultural operations and provide evidence linking declining rates of principal producer populations with specific features consistent with industrial agriculture. These findings are specific to the State of Ohio, but also raise much larger questions about which populations are experiencing more rapid rates of farm exit, and what implications these trends have for food security on a broader scale.
ContributorsMoore, Phillip (Author) / Chhetri, Nalini (Contributor) / Leonard, Bryan (Contributor) / Shrestha, Milan (Contributor)
Created2020
Description
An investigation is undertaken of a prototype building-integrated solar photovoltaic-powered thermal storage system and air conditioning unit. The study verifies previous thermodynamic and economic conclusions and provides a more thorough analysis. A parameterized model was created for optimization of the system under various conditions. The model was used to evaluate energy and cost savings to determine viability of the system in several circumstances, such as a residence in Phoenix with typical cooling demand. The proposed design involves a modified chest freezer as a thermal storage tank with coils acting as the evaporator for the refrigeration cycle. Surrounding the coils, the tank contains small containers of water for high-density energy storage submerged in a low freezing-point solution of propylene glycol. The cooling power of excess photovoltaic and off-peak grid power that is generated by the air conditioning compressor is stored in the thermal storage tank by freezing the pure water. It is extracted by pumping the glycol across the ice containers and into an air handler to cool the building. Featured results of the modeling include the determination of an optimized system for a super-peak rate plan, grid-connected Phoenix house that has a 4-ton cooling load and requires a corresponding new air conditioner at 4.5 kW of power draw. Optimized for the highest payback over a ten year period, the system should consist of a thermal storage tank containing 454 liters (120 gallons) of water, a 3-ton rated air conditioning unit, requiring 2.7 kW, which is smaller than conventionally needed, and no solar photovoltaic array. The monthly summer savings would be $45.The upfront cost would be $5489, compared to a conventional system upfront cost of $5400, for a payback period of 0.33 years. Over ten years, this system will provide $2600 of savings. To optimize the system for the highest savings over a twenty year period, a thermal storage tank containing 272 liters (72 gallons) of water, a 40-m2 photovoltaic array with 15% efficiency, and a 3.5-ton, 3.1-kW rated air conditioning unit should be installed for an upfront cost of $19,900. This would provide monthly summer savings of $225 and 1062 kWh grid electricity, with a payback period of only 11 years and a total cost savings of $12,300 over twenty years. In comparison, a system with the same size photovoltaic array but without storage would result in a payback period of 16 years. Results are also determined for other cooling requirements and installation sizes, such that the viability of this type of system in different conditions can be discussed. The use of this model for determining the optimized system configuration given different constraints is also described.
ContributorsMagerman, Beth Francine (Author) / Phelan, Patrick (Thesis director) / Goodnick, Stephen (Committee member) / Chhetri, Nalini (Committee member) / Barrett, The Honors College (Contributor) / School of Sustainability (Contributor) / Mechanical and Aerospace Engineering Program (Contributor)
Created2013-05
Description
Small-scale fisheries are globally ubiquitous, employing more than 99% of the world’s fishers and providing over half of the world’s seafood. However, small-scale fisheries face many management challenges including declining catches, inadequate resources and infrastructure, and overcapacity. Baja California Sur, Mexico (BCS) is a region with diverse small-scale fisheries; these fisheries are intense, poorly regulated, and overlap with foraging hot spots of endangered sea turtles. In partnership with researchers, fishers, managers, and practitioners from Mexico and the United States, I documented bycatch rates of loggerhead turtles at BCS that represent the highest known megafauna bycatch rates worldwide. Concurrently, I conducted a literature review that determined gear modifications were generally more successful than other commonly used fisheries management strategies for mitigating bycatch of vulnerable megafauna including seabirds, marine mammals, and sea turtles. I then applied these results by partnering with researchers, local fishers, and Mexico’s federal fisheries science agency to develop and test two gear modifications (i.e. buoyless and illuminated nets) in operating net fisheries at BCS as potential solutions to reduce bycatch of endangered sea turtles, improve fisheries sustainability, and maintain fisher livelihoods. I found that buoyless nets significantly reduced mean turtle bycatch rates by 68% while maintaining target catch rates and composition. By contrast, illuminated nets did not significantly reduce turtle bycatch rates across day-night periods, although they reduced mean turtle bycatch rates by 50% at night. Illuminated nets, however, significantly reduced mean rates of total bycatch biomass by 34% across day-night periods while maintaining target fish catch and market value. I conclude with a policy analysis of the unilateral identification of Mexico by the U.S. State Department under section 610 of the Magnusson-Stevens Fishery Conservation and Management Act for failure to manage bycatch of loggerhead turtles at BCS. Taken together, the gear modifications developed and tested here represent promising bycatch mitigation solutions with strong potential for commercial adoption, but fleet-wide conversion to more selective and turtle-friendly gear (e.g. hook and line and/or traps) at BCS, coupled with coordinated international conservation action, is ultimately needed to eliminate sea turtle bycatch and further improve fisheries sustainability.
ContributorsSenko, Jesse (Author) / Smith, Andrew (Thesis advisor) / Boggess, May (Committee member) / Chhetri, Nalini (Committee member) / Jenkins, Lekelia (Committee member) / Minteer, Ben (Committee member) / Arizona State University (Publisher)
Created2015
Description
Without scientific expertise, society may make catastrophically poor choices when faced with problems such as climate change. However, scientists who engage society with normative questions face tension between advocacy and the social norms of science that call for objectivity and neutrality. Policy established in 2011 by the Intergovernmental Panel on Climate Change (IPCC) required their communication to be objective and neutral and this research comprised a qualitative analysis of IPCC reports to consider how much of their communication is strictly factual (Objective), and value-free (Neutral), and to consider how their communication had changed from 1990 to 2013. Further research comprised a qualitative analysis of structured interviews with scientists and non-scientists who were professionally engaged in climate science communication, to consider practitioner views on advocacy. The literature and the structured interviews revealed a conflicting range of definitions for advocacy versus objectivity and neutrality. The practitioners that were interviewed struggled to separate objective and neutral science from attempts to persuade, and the IPCC reports contained a substantial amount of communication that was not strictly factual and value-free. This research found that science communication often blurred the distinction between facts and values, imbuing the subjective with the authority and credibility of science, and thereby damaging the foundation for scientific credibility. This research proposes a strict definition for factual and value-free as a means to separate science from advocacy, to better protect the credibility of science, and better prepare scientists to negotiate contentious science-based policy issues. The normative dimension of sustainability will likely entangle scientists in advocacy or the appearance of it, and this research may be generalizable to sustainability.
ContributorsMcClintock, Scott (Author) / Van Der Leeuw, Sander (Thesis advisor) / Klinsky, Sonja (Committee member) / Chhetri, Nalini (Committee member) / Hannah, Mark (Committee member) / Arizona State University (Publisher)
Created2015
Description
During the months from June to November 2012, the city of Bangalore was faced with a serious solid waste management (SWM) crisis. In the wake of the upheaval, the state court declared source segregation to be mandatory. Yet, while the legislation was clear, the pathway towards a course of action for the transition was not clear and hence, Bangalore was stuck in a state of limbo. The objectives for this thesis spiraled organically from this crisis. The first objective was to examine the gaps in Bangalore's transition to a more sustainable SWM system. Six particular gaps were identified, which in essence, were opportunities to re-shape the system. The gaps identified included: conflicting political agendas, the exclusion of some key actors, and lack of adequate attention to cultural aspects, provision of appropriate incentives, protection of livelihoods and promotion of innovation. Opportunities were found in better incentivization of sustainable SWM goals, protecting livelihoods that depend on waste, enhancing innovation and endorsing local, context based SWM solutions. Building on this understanding of gaps, the second objective was to explore an innovative, local, bottom-up waste-management model called the Vellore Zero Waste Model, and assess its applicability to Bangalore. The adaptability of the model depended on several factors such as, willingness of actors to redefine their roles and change functions, ability of the municipality to assure quality and oversight, willingness of citizen to source segregate, and most importantly, the political will and collective action needed to ensure and sustain the transition. The role of communication as a vital component to facilitate productive stakeholder engagement and to promote role change was evident. Therefore, the third objective of the study was to explore how interpersonal competencies and communication strategies could be used as a tool to facilitate stakeholder engagement and encourage collective action. In addressing these objectives, India was compared with Austria because Austria is often cited as having some of the best SWM practices in the world and has high recycling rates to show for its reputation.
ContributorsRengarajan, Nivedita (Author) / Aggarwal, Rimjhim (Thesis advisor) / Chhetri, Nalini (Committee member) / Manuel-Navarrete, David (Committee member) / Arizona State University (Publisher)
Created2013
Descriptionnone
ContributorsZamil, Ruaa (Author) / Parmentier, Mary J (Thesis advisor) / Chhetri, Nalini (Committee member) / Grossman, Gary (Committee member) / Arizona State University (Publisher)
Created2013
Description
Haiti has witnessed high deforestation rates in recent decades, caused largely by the fuel needs of a growing population. The resulting soil loss is estimated to have contributed towards a decline in agricultural productivity of 0.5% -1.2% per year since 1997. Recent studies show the potential of biochar use through pyrolysis technology to increase crop yields and improve soil health. However, the appropriateness of this technology in the context of Haiti remains unexplored. The three objectives of this research were to identify agricultural- and fuel-use-related needs and gaps in rural Haitian communities; determine the appropriateness of biochar pyrolyzer technology, used to convert agricultural biomass into a carbon-rich charcoal; and develop an action-oriented plan for use by development organizations, communities, and governmental institutions to increase the likelihood of adoption. Data were collected using participatory rural appraisal techniques involving 30 individual interviews and three focus-group discussions in the villages of Cinquantin and La Boule in the La Coupe region of central Haiti. Topics discussed include agricultural practices and assets, fuel use and needs, technology use and adoption, and social management practices. The Sustainable Livelihoods framework was used to examine the assets of households and the livelihood strategies being employed. Individual and focus group interviews were analyzed to identify specific needs and gaps. E.M. Rogers' Diffusion of Innovations theory was used to develop potential strategies for the introduction of pyrolysis technology. Preliminary results indicate biochar pyrolysis has potential to address agricultural and fuel needs in rural Haiti. Probable early adopters of biochar technology include households that have adopted new agricultural techniques in the past, and those with livestock. Education about biochar, and a variety of pyrolysis technology options from which villagers may select, are important factors in successful adoption of biochar use. A grain mill as an example in one of the study villages provides a model of ownership and use of pyrolysis technology that may increase its likelihood of successful adoption. Additionally, women represent a group that may be well suited to control a new local biochar enterprise, potentially benefiting the community.
ContributorsDelaney, Michael Ryan (Author) / Aggarwal, Rimjhim (Thesis advisor) / Chhetri, Nalini (Committee member) / Henderson, Mark (Committee member) / Arizona State University (Publisher)
Created2011
Description
Sustainable communities discourse, literature and initiatives have essentially excluded poor marginalized communities at a time when sustainability efforts require more stakeholders and stakeholder involvement. The families in poor marginalized communities of color in the United States are struggling to meet basic needs (food, medicine, shelter, safety). Additionally, in these communities there is a disproportionate level of forced mobility to prisons, jails and detention centers. These communities are unsustainable. This dissertation is comprised of three articles. I present in the first article (published in Sustainability Journal) an argument for a definition of sustainability that includes recognition of the major, complex and persistent problems faced daily by poor marginalized communities of color (African American, Hispanic/Latino, Native American) including those connected to mass incarceration and high recidivism. I also propose a system-of-communities conceptual framework. In my second article, I explore sustainability assessment tools and find them to be inadequate for measuring the progress toward sustainability of poor marginalized communities with high incarceration and recidivism rates. In order to fill this gap, I developed the Building Sustainable Communities Framework and a Social Reintegration, Inclusion, Cohesion, Equity (Social R.I.C.E.) Transition Tool, a qualitative interview guide (a precursor to the development of a community sustainability assessment tool). In the third article, I test the utility of the Building Sustainable Communities Framework and Social R.I.C.E. Transition Tool through a community-based participatory action study: The Building Sustainable Communities-Repairing the Harm of Incarceration Pilot Project. Three types of participants were included, formerly incarcerated, family members of formerly incarcerated and community members. The Restorative Justice Circle process (based on a traditional practice of Native Americans and other indigenous peoples) was also introduced to the groups for the purpose of having discussions and sharing personal stories in a safe, nonthreatening, confidential and equitable space. During the study, data was gathered for reflexive thematic analysis from two participant groups, in-depth interviews, focus groups and short qualitative surveys. The findings reflect the community is in dire need of a path to stability and sustainability and needs the knowledge and tools to help them make collective community decisions about present and future sustainability issues.
ContributorsAdams, Muriel (Author) / Chhetri, Nalini (Thesis advisor) / Klinsky, Sonja (Thesis advisor) / Boone, Christopher (Committee member) / Pranis, Kay (Committee member) / Arizona State University (Publisher)
Created2021
Description
Energy poverty and vulnerability are among the world’s most difficult and enduring development challenges. Over one billion people worldwide, some in the richest countries, continue to experience the impacts of these conditions in everyday life. Part of the reason for the enduring failure to eliminate energy poverty and vulnerability is the deep theoretical and practical confusion among scholars, States, and electric utilities over the nature of these problems, how they work, and how to fix them. In this dissertation, grounded in Guyana, I examine how energy vulnerability emerges in electrified life and what energy systems might do to reduce energy vulnerability and enhance capabilities. In so doing, I contribute to theoretical perspectives on the nature of energy vulnerability and ongoing advocacy for its attention in public policy and global development. This is achieved through a multi-modal methodology centered on institutional analysis of the household and the electric utility in which imaginaries, articulations and actions of these institutions are coded and compared. This comparison helped to uncover a disconnect between these institutions resulting from a lack of visibility of what the household does in everyday life. The disconnect between the goals of efficiency (held by utilities) and effectiveness (held by households) is the main driver of energy vulnerability, exacerbated by their separate decision-making. The household institution, seeking to maintain stability in everyday life, enacts strategies in response to disruptive situations that are invisible to decision-makers at the utility but feedback to the electricity system. This dissertation calls for social innovations in the institutional arrangements of electric utilities to help them better understand what households are doing and, as a result, to reduce energy vulnerability and enhance capabilities. I argue that social innovation is necessary for resituating the household institution as an important stakeholder in energy transition and for remaking the visibility of electrified life in the governance of energy systems.
ContributorsHinds, Norwell Jermin (Author) / Miller, Clark A (Thesis advisor) / Chhetri, Nalini (Thesis advisor) / Schoon, Michael (Committee member) / Calhoun, Craig (Committee member) / Arizona State University (Publisher)
Created2024
Description
This study explores the responses of Arizona’s Refugee SupportNetwork (RSN) to the COVID-19 disaster, focusing on the role of both formal
and informal networks in shaping refugee access to services. Research
demonstrates that resilient refugee support systems must be informed by the
communities they serve. However, mainstream refugee resettlement programs
often need more flexibility to integrate local, community-based feedback into
their service delivery models, limiting the adaptability of formal support
networks during disasters. Through 17 expert interviews and 19 refugee
community interviews, analysis of disaster and COVID-19 policies, and social
infrastructure mapping this research explored how informal and formal
networks shifted to remote services and the lived experiences of refugees
navigating systemic barriers like digital literacy and institutional distrust. The
findings highlight that neither formal nor informal networks can effectively
operate in isolation; their integration is essential for addressing gaps in service
delivery and ensuring adaptable, inclusive support, particularly during crises
like the COVID-19 disaster. While formal networks, such as local resettlement
agencies (LRAs), were constrained by regulatory frameworks and rigid
workflows, community-based organizations (CBOs) were able to leverage
grassroots approaches and culturally responsive strategies to fill service gaps.
ContributorsReiswig, Clinton (Author) / Smith, Lindsay (Thesis advisor) / Chhetri, Nalini (Committee member) / Um, Mee Young (Committee member) / Arizona State University (Publisher)
Created2024