Agricultural influences on carbon emissions and sequestration

This report was presented at the UK Organic Research 2002 Conference. Agricultural systems contribute to carbon emissions through several mechanisms: the direct use of fossil fuels in farm operations, the indirect use of embodied energy in inputs that are energy intensive to manufacture (e.g. fertilizers), and the cultivation of soils resulting in the loss of soil organic matter. However agriculture can also sequester carbon when organic matter accumulates in the soil or above-ground woody biomass acts as a permanent sink or is used as an energy source that substitutes for fossil fuels. The latest empirical data on agricultural carbon emissions and carbon sequestration opportunities in agricultural systems are reviewed and the necessary land use and management practices that will need to be employed to optimise carbon sequestration are considered

Desain Media Pembelajaran Fisika Interaktif pada Materi Momen Inersia Benda Tegar dengan Menggunakan Program Autodesk 3ds Max 2010 dan Adobe Director 11.5

Penggunaan media dalam pembelajaran berfungsi untuk mempermudah penyampaian informasi, memvisualisasikan materi dengan baik, dan membuat pembelajaran menjadi lebih menarik. Fisika merupakan salah satu cabang dari Ilmu Pengetahuan Alam (IPA) yang materi-materi pembelajarannya berkaitan langsung dengan konteks kehidupan nyata. Oleh karena itu, diperlukan adanya media visual untuk memudahkan penyampaian materinya. Penelitian pengembangan ini bertujuan untuk mendesain dan menghasilkan media pembelajaran fisika interaktif pada materi momen inersia benda tegar dengan menggunakan program Autodesk 3ds Max 2010 dan Adobe Director 11.5. Penelitian ini dilaksanakan dalam tiga tahap yaitu tahap awal (studi pustaka, instalasi software, analisis), tahap pembuatan (pengumpulan konten, pengembangan, publish hasil), dan tahap evaluasi (penyesuaian kerangka konseptual, pencocokan materi, evaluasi, revisi, mengemas media pembelajaran). Berdasarkan hasil penelitian dapat disimpulkan program Autodesk 3ds Max 2010 dan Adobe Director 11.5 dapat digunakan untuk mendesain media pembelajaran fisika interaktif pada materi momen inersia benda tegar

Environmental and macroeconomic impact assessment of different development scenarios to organic and low-input farming in Croatia

This study was commissioned by the UN Food and Agriculture Organization (FAO) within the framework of an FAO technical assistance project for Croatia. It assessed macroeconomic and environmental impact assessment of large-scale conversion to organic agriculture. It examined the consequences of such a conversion to national agricultural output and related environmental and economic performance. The assessment also took into account the impact of wide-spread adoption of organic agriculture on farm-upstream linked sectors (FULS). These include energy production and supply, manufacturing of agri-chemical inputs, trade, transport and research, education, advisory, veterinary and administrative services. The agricultural output, environmental and economic performance of the baseline scenario (average of 2001-2003) was compared with fourteen development scenarios involving various shares of utilised agricultural land (UAA) under organic management (10, 25, 50 and 100 per cent) and different yields (100, 75 and 50 per cent of the baseline). In order to obtain the real value added (RVA) created by farming and FULS, the generated gross value added (GVA) was corrected for the associated environmental costs (damage to air, water and soil) and public investments. A monetary value was assigned to all identified environmental damages throughout farming and FULS using various environmental accounting methods. If the entire UAA in Croatia converted to organic farming and if the crops and livestock gave the same yields as in the baseline situation, the farming and FULS would generate a 43 per cent higher annual GVA and 155 per cent higher annual RVA than the baseline scenario. This scenario implies refraining from the use of nearly all agri-chemical inputs. It consumes far less fossil energy (notably in FULS) and causes less environmental damage to soil and water (notably in the farming sector). Consequently, its environmental costs are nearly two times lower than in the baseline. The study results suggest that Croatian farming and FULS in the period 2001-2003 when measured in terms of RVA produced a negative effect on the economy and society in general. Farming is the key sector since it accounts for 90 per cent of the workforce, 61 per cent of GVA, 89 per cent of environmental costs and 77 per cent of public investments of the entire economic chain examined. The scenario involving a 100 per cent organic area, but yielding only 75 per cent of the baseline scenario produces a 17 per cent lower GVA. However, when corrected for public investments and environmental costs it results in 71 per cent higher RVA than the baseline scenario. The 100 per cent organic area scenario achieving only half of the baseline yields results in both lower GVA (75 percent lower) and RVA (6 per cent lower) than the baseline scenario. Of all examined scenarios, this is the least favourable for organic farming as its results exhibit the biggest discrepancies in comparison with the baseline situation. Similar results were obtained in all other scenarios (involving 50, 25 and 10 per cent organic area with 100, 75 and 50 per cent yield levels as compared to the baseline). The organic options, measured against the RVA created are better (7-89 per cent), only in cases where the yield level is 75 or 100 percent of the baseline. If the obtained yields are 50 per cent lower, the organic scenario options create both lower GVA (1, 19 and 37 per cent) and RVA (1, 2 and 3 per cent) than the baseline. The scenarios assuming a 10 per cent premium price (10 and 25 per cent organic area achieving 75 per cent of the baseline yields) create about the same GVA as the baseline, but 10-25 per cent higher RVA. All scenarios involving organic farming decrease environmental costs compared to the baseline. Provided the yield is not 50 per cent lower, all organic scenarios result in a higher RVA than the baseline. The agricultural output (yields) remains the key factor in determining the feasibility of a shift to organic farming. A severe reduction in agricultural output jeopardises national food security. However, since organic farming goes hand in hand with careful management, in the case of Croatia it would not necessarily lead to (much) lower yields. Pioneering efforts in Croatia, as well as evidence from other countries with a similar agricultultural situation also indicate this. Conversion to large-scale organic farming requires high human and social capital. Organic farming is low-input from the point of view of the use of external farming inputs, but is high-input from the point of view of the knowledge and skills needed. In the case of Croatia where farmers and other key stakeholders have a relatively low level of general education and poor agricultural training, this point will certainly be the main obstacle preventing a greater spread of organic farming. Policy efforts should therefore focus primarily on stimulating the formation of social capital and increasing human capacities of all stakeholders involved in the organic food chain

Impact of Organic Agriculture on the Environmental and Economic Performance of Croatia

Within the framework of an FAO technical assistance project for Croatia a study assessing the feasibility of large-scale conversion to organic farming was carried out. It examined the consequences of the conversion of a substantial portion of Croatian agricultural land to organic farming in relation to national agricultural output (food security) and related environmental and economic performance. As farming is closely linked with a range of economic activities, besides farming the assessment also took into account the impact of wide-spread adoption of organic agriculture on farm-upstream linked sectors (FULS). These include energy production and supply, manufacturing of agri-chemical inputs, trade, transport and research, education, advisory, veterinary and administrative services. The agricultural output, environmental and economic performance of the baseline scenario (average of 2001-2003) was compared with fourteen development scenarios involving various shares of utilised agricultural land (UAA) under organic management (10, 25, 50 and 100 per cent) and different yields (100, 75 and 50 per cent of the baseline). In order to enable the same consumer purchasing power as in the baseline situation, organic products were assumed to obtain no premium price in twelve scenarios. In two scenarios approaching the current situation in some European countries (10 and 25 per cent of UAA under organic management with 75 per cent yield) a 10 per cent premium price for organic produce was included. In order to obtain the real value added (RVA) created by farming and FULS, the generated gross value added (GVA) was corrected for the associated environmental costs (damage to air, water and soil) and public investments. The public investments, emissions and environmental degradation of air, water and soil were quantified using data from various official documents and databases, as well as by performing new calculations. A monetary value was assigned to all identified environmental damages throughout farming and FULS using various environmental accounting methods. The difference between the GVA created by the examined economic chain and the sum of environmental costs and public investments resulted in the RVA. The RVA was used as a measurement indicating the economic feasibility of organic farming development scenarios as compared with the baseline scenario. If the entire UAA in Croatia converted to organic farming and if the crops and livestock gave the same yields as in the baseline situation, the farming and FULS would generate a 43 per cent higher annual GVA and 155 per cent higher annual RVA than the baseline scenario. This scenario implies refraining from the use of nearly all agri-chemical inputs. It consumes far less fossil energy (notably in FULS) and causes less environmental damage to soil and water (notably in the farming sector). Consequently, its environmental costs are nearly two times lower than in the baseline. The study results suggest that Croatian farming and FULS in the period 2001-2003 when measured in terms of RVA produced a negative effect on the economy and society in general. Farming is the key sector since it accounts for 90 per cent of the workforce, 61 per cent of GVA, 89 per cent of environmental costs and 77 per cent of public investments of the entire economic chain examined. The scenario involving a 100 per cent organic area, but yielding only 75 per cent of the baseline scenario produces a 17 per cent lower GVA. However, when corrected for public investments and environmental costs it results in 71 per cent higher RVA than the baseline scenario. The 100 per cent organic area scenario achieving only half of the baseline yields results in both lower GVA (75 percent lower) and RVA (6 per cent lower) than the baseline scenario. Of all examined scenarios, this is the least favourable for organic farming as its results exhibit the biggest discrepancies in comparison with the baseline situation. Similar results were obtained in all other scenarios (involving 50, 25 and 10 per cent organic area with 100, 75 and 50 per cent yield levels as compared to the baseline). The organic options, measured against the RVA created are better (7-89 per cent), only in cases where the yield level is 75 or 100 percent of the baseline. If the obtained yields are 50 per cent lower, the organic scenario options create both lower GVA (1, 19 and 37 per cent) and RVA (1, 2 and 3 per cent) than the baseline. The scenarios assuming a 10 per cent premium price (10 and 25 per cent organic area achieving 75 per cent of the baseline yields) create about the same GVA as the baseline, but 10-25 per cent higher RVA. All scenarios involving organic farming decrease environmental costs compared to the baseline. Provided the yield is not 50 per cent lower, all organic scenarios result in a higher RVA than the baseline. The agricultural output (yields) remains the key factor in determining the feasibility of a shift to organic farming. A severe reduction in agricultural output jeopardises national food security. However, since organic farming goes hand in hand with careful management, in the case of Croatia it would not necessarily lead to (much) lower yields. Pioneering efforts in Croatia, as well as evidence from other countries with a similar agricultultural situation also indicate this. Conversion to large-scale organic farming requires high human and social capital. Organic farming is low-input from the point of view of the use of external farming inputs, but is high-input from the point of view of the knowledge and skills needed. In the case of Croatia where farmers and other key stakeholders have a relatively low level of general education and poor agricultural training, this point will certainly be the main obstacle preventing a greater spread of organic farming. Policy efforts should therefore focus primarily on stimulating the formation of social capital and increasing human capacities of all stakeholders involved in the organic food chain

Logging activities in mangrove forests: A case study of Douala Cameroon

The Cameroon mangroves are exploited by local communities through fishing, hunting, and especially logging for fuel-wood and charcoal. The changing demographic patterns in the region have increased the need of citizens in the urban centres, which in turn, has accelerated the pressure on the neighbouring forests. The objective of these studies was to assess the impact of local communities on the mangroves’ development. Through an eight point semi-structured questionnaire, 120 mangrove loggers were interviewed in the local markets in Douala. The survey data show that 61% of respondents are permanent workers and do not envisage quitting this mode of employment. The surface area destroyed annually approximates 1000 ha. Species of the genus Rhizophora are mostly exploited, with about 200,000 trees cut down per year. The declared revenues are about 400,000 Euros per year. Further analysis of information from different sources suggests that the total annual income could amount to four millions euros. These estimates show that the mangroves have a significant economic value and require significant improvement in modes of exploitation to include strategies for sustainable management.Key words: Anthropogenic impact, deforestation, Douala-Cameroon, economic value, loggers, mangroves,  Rhizophora

Social capital and connectedness: Issues and implications for agriculture, rural development and natural resource management in ACP countries

Abstract Social capital is a new term that refers to the value of connectedness and trust between people. It is a pre-requisite for sustainable management and development of natural resources. For as long as people have managed natural resources, they have engaged in forms of collective action. As a result, constructive resource management rules and norms have been embedded in many cultures and societies. But in recent agricultural and rural development, it has been rare for the importance of local groups and institutions to be recognised. Social capital is one of five key assets for sustainable livelihoods. Although some believe that the term ‘capital’ does not add anything to existing social theories and practice, it does nonetheless draw clear attention to the problem of depletion of assets. Sustainability implies maintaining or improving renewable assets for future generations. As it lowers the costs of working together, social capital facilitates cooperation. People have the confidence to invest in collective activities, knowing that others will also do so. They are also less likely to engage in unfettered private actions that result in negative impacts, such as resource degradation

ESPECTRA: Searching the Bipolar Spectrum in Eating Disorder patients

<p>Abstract</p> <p>Background</p> <p>Bipolar Disorder (BD) is a chronic, recurrent and highly prevalent illness. Despite the need for correct diagnosis to allow proper treatment, studies have shown that reaching a diagnosis can take up to ten years due to the lack of recognition of the broader presentations of BD. Frequent comorbidities with other psychiatric disorders are a major cause of misdiagnosis and warrant thorough evaluation.</p> <p>Methods/Design</p> <p>ESPECTRA (<it>Occurrence of Bipolar Spectrum Disorders in Eating Disorder Patients</it>) is a single-site cross-sectional study involving a comparison group, designed to evaluate the prevalence of bipolar spectrum in an eating disorder sample. Women aged 18-45 years will be evaluated using the SCID-P and Zurich criteria for diagnosis and the HAM-D, YOUNG, SCI-MOODS, HCL-32, BIS-11, BSQ, WHOQoL and EAS instruments for rating symptoms and measuring clinical correlates.</p> <p>Discussion</p> <p>The classificatory systems in psychiatry are based on categorical models that have been criticized for simplifying the diagnosis and leading to an increase in comorbidities. Some dimensional approaches have been proposed aimed at improving the validity and reliability of psychiatric disorder assessments, especially in conditions with high rates of comorbidity such as BD and Eating Disorder (ED). The Bipolar Spectrum (BS) remains under-recognized in clinical practice and its definition is not well established in current diagnostic guidelines. Broader evaluation of psychiatric disorders combining categorical and dimensional views could contribute to a more realistic understanding of comorbidities and help toward establishing a prognosis.</p

Of Mice and Men and Trillium: Cascading Effects of Forest Fragmentation

Cascading ecological effects of anthropogenic habitat fragmentation have been studied primarily in extreme cases (e.g., the isolation of habitat fragments in a novel habitat matrix such as suburban developments, reservoirs, or agricultural fields), with less attention to more subtle and widespread cases, such as habitat fragmentation due to timber harvest. Few studies have used rigorous demographic data to demonstrate the direct and indirect effects of habitat fragmentation. We trapped deer mice (Peromyscus maniculatus) at five sites over two years in southwest Oregon, USA, and used multi-state capture-recapture models to estimate deer mouse survival and movement in clearcuts; forest-fragment edges, forest-fragment interiors, and contiguous forests. We also estimated deer mouse densities in fragmented and unfragmented forests and combined deer mouse demographic studies with trillium (Trillium ovatum) seed predation trials to link deer mouse changes to reduced trillium recruitment previously observed at the same study sites. Mouse survival was highest in clearcuts, intermediate in forest fragments, and lowest in unfragmented.(control) forests. Mouse movement among clearcuts, forest edges, and forest interiors was common over short time intervals. Collectively, demographic rates led to mouse densities that were 3-4 times higher at forest-fragment sites than at unfragmented sites. Trillium seeds were similar to3 times more likely to be depredated in areas of elevated relative mouse abundance than in areas of lower relative abundance. Forest fragmentation has favored mouse populations, resulting in increased seed predation that may decrease recruitment rates and increase local extinction risks for trillium

Measurement of an AGN Central Mass on Centiparsec Scales: Results of Long-Term Optical Monitoring of Arp 102B

The optical spectrum of the broad-line radio galaxy Arp 102B has been monitored for more than thirteen years to investigate the nature of the source of its broad, double-peaked hydrogen Balmer emission lines. The shape of the lines varied subtly; there was an interval during which the variation in the ratio of the fluxes of the two peaks appeared to be sinusoidal, with a period of 2.16 years and an amplitude of about 16% of the average value. The variable part of the broad H-alpha line is well fit by a model in which a region of excess emission (a quiescent ``hot spot'') within an accretion disk (fitted to the non-varying portion of the double-peaked line) completes at least two circular orbits and eventually fades. Fits to spectra from epochs when the hot spot is not present allow determination of the disk inclination, while fits for epochs when it is present provide a measurement of the radius of the hot spot's orbit. From these data and the period of variation, we find that the mass within the hot spot's orbit is 2.2 +0.2/-0.7 times 10^8 solar masses, within the range of previous estimates of masses of active galactic nuclei. Because this mass is determined at a relatively small distance (~1000 AU) from the central body, it is extremely difficult to explain without assuming that a supermassive black hole lies within Arp 102B. The lack of any systematic change in the velocity of the blue peak over time yields a lower limit on the combined mass of the two bodies in a binary black hole model like that of Gaskell (1983) of 10^10 solar masses.Comment: 29 pages, including 6 figures; to appear in the Astrophysical Journal 199