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Publication Evaluating a Refrigerator Replacement Program For Low-Income Customers as a Cost-Effective Climate StrategyMontañez, BiancaThe energy transition is driving the implementation of cleaner energy infrastructure and more efficient technology for millions of Americans. Two significant pieces of American legislation, the Inflation Reduction Act (IRA) and the Bipartisan Infrastructure Law (BIL) are driving the transition in the U.S., aiming to enhance energy efficiency across the country. However, low-income communities continue to face significant barriers to accessing rebates to replace energy-efficient appliances. This study employs a mixed-methods approach to examine whether a streamlined program to replace outdated, inefficient refrigerators in low-income households could serve as a cost-effective strategy to reduce Greenhouse Gas (GHG) emissions, improve energy security for low-income customers, and address administrative barriers in accessing federal incentives. We first explore administrative challenges, including application complexities, technological barriers, and eligibility discrepancies that hinder low-income households from fully benefiting from energy efficiency incentives, to establish the problem present with rebate programs. We then utilize emissions calculations alongside grid decarbonization assumptions to conduct a cost-benefit analysis that evaluates the energy efficiency and environmental impact of replacing outdated refrigerators with modern ENERGY STAR-certified models. Our results demonstrate that replacing outdated refrigerators with energy-efficient models significantly reduces electricity consumption and carbon emissions. Given that the program costs for the three scenarios analyzed are less than the social cost of carbon (SC-CO₂) estimated at $194 per metric ton CO₂e, results suggest that a refrigerator replacement program should be considered a cost-effective, accessible climate strategy that provides energy security benefits to low-income households. Ultimately, the outcomes of this research are crucial to better understanding practical adaptive solutions for a more economically viable and equitable energy transition.Publication Video Presentation: Are Greenland Ice Sheet meltwaters a significant source of manganese?Leah HopfThe Greenland Ice Sheet (GrIS) is the second largest ice mass on Earth, covering approximately 20% of Arctic land surface area. As rising global temperatures increase annual melting of the GrIS, it is increasingly important to determine the ability of ice melt to transport nutrients and contaminants to nearby oceans where they can impact marine ecosystems. Manganese (Mn) is a trace element and essential micronutrient that can limit phytoplankton growth, and it therefore plays an important role for ecosystem health. Despite its biological importance, observational data on Mn concentrations and reactivity in the cryosphere is limited, and the role of the GrIS in the Mn biogeochemical cycle remains largely unknown. Here, I compare spatial Mn trends in GrIS meltwaters to assess the hypothesis that glacially derived Mn is a critical micronutrient source for coastal marine ecosystems. Suspended sediments were collected daily between early June-late July from the Watson River (southwestern Greenland) in 2023 and the Kiattuut Sermiat meltwater river (southern Greenland) in 2024. Mn was extracted from the sediments using sequential extractions, and Mn concentrations were analyzed by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Concentrations of total Mn in glacial meltwater rivers are several orders of magnitude higher than in a nearby precipitation-fed stream, indicating that glacially derived sediment may be the dominant source of particulate Mn exported from GrIS catchments. To my knowledge, this study provides the first dataset of particulate Mn in GrIS meltwaters, addressing a significant gap in current understandings of Mn inputs from glacial environments.Publication Penn Library's Ms. Codex 674 - [Horae de Sancta Katherina]. (Video Orientation)Porter, DotVideo Orientation to the University of Pennsylvania Library's Ms. Codex 674, Hours of St. Catherine, incomplete at the end, where prayers to St. Barbara, an Office of St. Barbara, and the Passion account from the Gospel of Matthew (partial) are added in a second hand. Written in Germany in the early 15th century (Zacour-Hirsch). 19th-century description tipped onto front endleaf has date ca. 1390. Record on Find (link to digitized copy): https://find.library.upenn.edu/catalog/9924874603503681?hld_id=22283686350003681Publication Penn Library's Ms. Codex 665 - Venetian Capitulary. (Video Orientation)Porter, DotVideo Orientation to the University of Pennsylvania Library's Ms. Codex 665, statutes in 151 chapters of the Order of the Ship, founded in Naples in 1381 by King Carlo III 'di Durazzo'. Presumably copied sometime between the founding of the order on 1 December 1381 (date on f. 21 r) and the death of Carlo III in 1386. Record on Find (link to digitized copy): https://find.library.upenn.edu/catalog/9924874513503681?hld_id=22283691260003681Publication Penn Library's Ms. Codex 1280 - [Ledger of Medici debtors and creditors]. (Video Orientation)Porter, DotVideo Orientation to the University of Pennsylvania Library's Ms. Codex 1280, ledger of debtors and creditors of the Medici family for the years 1537-1539. Often includes the nature of a given credit or debt and its amount, as well as listing the names of the individuals or institutions that hold the debt or credit, the most important being the Spedale e Spedaletto di Santa Maria Novella (p. 7, 22), a Florentine church which also offered pilgrims and those in need medical help; the Chapitolo and Convento delle monache delle convertite (p. 17), a nunnery for young women, often prostitutes, who converted to Catholicism; and the Opera di Santa Maria del Fiore (p. 60). An alphabetical index, with 18 lettered tabs, containing names of individuals and institutions that appear in the ledger, is laid into the manuscript. Written in Italy, ca. 1539 (date of latest entries, p. 98). Record on Find (link to digitized copy): https://find.library.upenn.edu/catalog/9944302523503681?hld_id=22416113250003681