Crop Production Variability and U.S. Ethanol Mandates

U.S. agricultural commodity prices have been volatile in recent years, attributed to many factors, including renewable fuel standard mandates (RFS). While the RFS is legislatively able to be altered, the mandate largely required the same volume of corn for ethanol in the 2012 drought year as it would have if 2012 were a normal production year. This caused corn prices to surge, bestowing significant economic ramifications throughout the agricultural industry. An important question arose from these events, was this avoidable with a RFS relaxation policy? In this work, the economic effects of such a policy that relaxes the conventional ethanol mandates in cases of major corn production shortfalls are investigated to determine the market relationships between RFS policy and commodity markets. This is done in a three step process. First the historical incidence of shortfalls is addressed by developing a stationary probability distribution of total and regional production using econometric procedures. Second, the short-run economic impact of RFS relaxation alternatives is investigated using an optimization modeling framework where crop mix and livestock breeding herds are held fixed. Third, the long-run implications of RFS relaxation are investigated by coupling the previous model with a stochastic optimization framework of ag-producer decisions with recourse. When a shortfall driven relaxation policy is in place, crop mix/livestock breeding decisions are able to adjust. The results show RFS relaxation has a significant impact on reducing price spikes and livestock production decreases due to reduced feeding costs when shortfalls occur. Although an ethanol waiver benefits consumers through decreased commodity prices, the reduction in producer welfare was found to be greater, resulting in an overall negative welfare impact when only considering agricultural impacts. In the longer-run analysis, the RFS relaxation again mitigates price spikes during production shortfall years but also stimulates a producer response of decreasing corn acreage. This caused corn prices in non-shortfall years to increase, resulting in a negligible impact on average long-run corn prices, while reducing commodity price variability. The model findings demonstrated that positive risk reduction implications could exist from a production-dependent conventional ethanol waiver, with limited long-run changes to future expected prices

A Participatory Exercise in Developing Syllabi with Adult Learners

Access the online Pressbooks version of this article here. Transformative participatory approaches in education are positioned to challenge traditional models where instructors bear all responsibility for knowledge creation and learners are passive recipients of knowledge. The promotion of participatory learning and critical pedagogy is essential to helping professionals seeking to understand oppressive structural barriers and employing strategies to dismantle these structures. This article describes a participatory approach undertaken to guide learners through an exercise to co-create syllabus content in a graduate social work course. Learners identified three themes, concerns, fears, and problems, related to the course material. Learners were also asked to think about how they could address the three themes to apply new information to problem solve. Through the syllabus cloud activity, learners shaped course content, decided on the format to deliver content, and applied their status as adult learners in an intentional way. As educators prepare to critically and intentionally dismantle aspects of the learning milieu that may perpetuate systems of oppression, collaborative learning and teaching can help to reduce oppressive practices. Reflections for formative and summative evaluation and future research are discussed

The Challenge of Climate Change Adaptation for Agriculture: an Economically Oriented Review

Climate change is occurring. Deviations from historic temperatures and precipitation plus increased frequency of extreme events are modifying agriculture systems globally. Adapting agricultural management practices offers a way to lessen the effects or exploit opportunities. Herein many aspects of the adaptation issue are discussed, including needs, strategies, observed actions, benefits, economic analysis approaches, role of public/private actors, limits, and project evaluation. We comment on the benefits and shortcomings of analytical methods and suggested economic efforts. Economists need to play a role in such diverse matters as projecting adaptation needs, designing adaptation incentives, and evaluating projects to ensure efficiency and effectiveness

Persistent neuronal Ube3a expression in the suprachiasmatic nucleus of Angelman syndrome model mice

Mutations or deletions of the maternal allele of the UBE3A gene cause Angelman syndrome (AS), a severe neurodevelopmental disorder. The paternal UBE3A/Ube3a allele becomes epigenetically silenced in most neurons during postnatal development in humans and mice; hence, loss of the maternal allele largely eliminates neuronal expression of UBE3A protein. However, recent studies suggest that paternal Ube3a may escape silencing in certain neuron populations, allowing for persistent expression of paternal UBE3A protein. Here we extend evidence in AS model mice (Ube3am–/p+) of paternal UBE3A expression within the suprachiasmatic nucleus (SCN), the master circadian pacemaker. Paternal UBE3A-positive cells in the SCN show partial colocalization with the neuropeptide arginine vasopressin (AVP) and clock proteins (PER2 and BMAL1), supporting that paternal UBE3A expression in the SCN is often of neuronal origin. Paternal UBE3A also partially colocalizes with a marker of neural progenitors, SOX2, implying that relaxed or incomplete imprinting of paternal Ube3a reflects an overall immature molecular phenotype. Our findings highlight the complexity of Ube3a imprinting in the brain and illuminate a subpopulation of SCN neurons as a focal point for future studies aimed at understanding the mechanisms of Ube3a imprinting

Physical Activity Levels of Older Community-dwelling Adults Are Influenced by Summer Weather Variables

Adequate daily physical activity (PA) is important for maintaining functional capacity and independence in older adults. However, most older adults in Canada do not engage in enough PA to sustain fitness and functional independence. Environmental influences, such as warmer daytime temperatures, may influence PA participation; however, few studies have examined the effect of summertime temperatures on PA levels in older adults. This investigation measured the influence of summertime weather variables on PA in 48 community-dwelling older adults who were randomly recruited from a local seniors’ community centre. Each participant wore an accelerometer for a single 7-consecutive-day period (between 30 May and 9 August 2006) during waking hours, and completed a PA logbook to remark on major daily PA events. Local weather variables were collected from a national weather service and compared with PA counts per minute. Regression analysis revealed a curvilinear relationship between log-transformed PA and mean daily temperature (r2 = 0.025; p \u3c 0.05). Linear mixed effects models that accounted for repeated measures nested within individuals were performed for monthly periods, meteorological variables, sex, age, and estimated maximal oxygen consumption, with PA as the dependent variable. Age and Air Quality Index remained significant variables within the model. Higher fitness levels had no effect on allowing individuals to perform more vigorous PA in warmer temperatures

Shared decision making in patients with low risk chest pain: prospective randomized pragmatic trial.

OBJECTIVE: To compare the effectiveness of shared decision making with usual care in choice of admission for observation and further cardiac testing or for referral for outpatient evaluation in patients with possible acute coronary syndrome. DESIGN: Multicenter pragmatic parallel randomized controlled trial. SETTING: Six emergency departments in the United States. PARTICIPANTS: 898 adults (aged \u3e17 years) with a primary complaint of chest pain who were being considered for admission to an observation unit for cardiac testing (451 were allocated to the decision aid and 447 to usual care), and 361 emergency clinicians (emergency physicians, nurse practitioners, and physician assistants) caring for patients with chest pain. INTERVENTIONS: Patients were randomly assigned (1:1) by an electronic, web based system to shared decision making facilitated by a decision aid or to usual care. The primary outcome, selected by patient and caregiver advisers, was patient knowledge of their risk for acute coronary syndrome and options for care; secondary outcomes were involvement in the decision to be admitted, proportion of patients admitted for cardiac testing, and the 30 day rate of major adverse cardiac events. RESULTS: Compared with the usual care arm, patients in the decision aid arm had greater knowledge of their risk for acute coronary syndrome and options for care (questions correct: decision aid, 4.2 v usual care, 3.6; mean difference 0.66, 95% confidence interval 0.46 to 0.86), were more involved in the decision (observing patient involvement scores: decision aid, 18.3 v usual care, 7.9; 10.3, 9.1 to 11.5), and less frequently decided with their clinician to be admitted for cardiac testing (decision aid, 37% v usual care, 52%; absolute difference 15%; P CONCLUSIONS: Use of a decision aid in patients at low risk for acute coronary syndrome increased patient knowledge about their risk, increased engagement, and safely decreased the rate of admission to an observation unit for cardiac testing.Trial registration ClinicalTrials.gov NCT01969240

How to meet new global targets in the offshore realms: biophysical guidelines for offshore networks of no-take marine protected areas

Networks of no-take marine protected areas (MPAs), where all extractive activities are prohibited, are the most effective tool to directly protect marine ecosystems from destructive and unsustainable human activities. No-take MPAs and MPA networks have been globally implemented in coastal seas, and their success has been significantly enhanced where science-based biophysical guidelines have informed their design. Increasingly, as human pressure on marine ecosystems is expanding further offshore, governments are establishing offshore MPAs—some very large—or MPA networks. Globally, there are growing calls from scientists, non-government organisations, and national governments to set global conservation targets upwards of 30%. Given that most of the ocean is found either in the high seas or offshore within national Exclusive Economic Zones, large offshore MPAs or networks of MPAs must be a major component of these global targets for ocean protection. However, without adequate design, these offshore MPAs risk being placed to minimise conflict with economic interests, rather than to maximise biodiversity protection. This paper describes detailed biophysical guidelines that managers can use to design effective networks of no-take MPAs in offshore environments. We conducted a systematic review of existing biophysical design guidelines for networks of MPAs in coastal seas, and found consistent elements relating to size, shape, connectivity, timeframes, and representation of biophysical features. However, few of the guidelines are tailored to offshore environments, and few of the large offshore MPAs currently in place were designed systematically. We discuss how the common inshore design guidelines should be revised to be responsive to the characteristics of offshore ecosystems, including giving consideration of issues of scale, data availability, and uncertainty. We propose 10 biophysical guidelines that can be used to systematically design offshore networks of MPAs which will also contribute to the global goal of at least 30% protection globally. Finally, we offer three priority guidelines that reflect the unique conservation needs of offshore ecosystems: emphasising the need for larger MPAs; maximising the inclusion of special features that are known and mapped; and representing minimum percentages of habitats, or, where mapped, bioregions. Ultimately, MPA guidelines need to be embedded within an adaptive management framework, and have the flexibility to respond to emerging knowledge and new challenges