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| Registros recuperados: 157 | |
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| Sedjo, Roger A.; Sohngen, Brent; Mendelsohn, Robert. |
| This study develops cumulative carbon 'supply curves' for global forests utilizing an dynamic timber supply model for sequestration of forest carbon. Because the period of concern is the next century, and particular time points within that century, the curves are not traditional Marshallian supply curves or steady-state supply curves. Rather, the focus is on cumulative carbon cost curves (quasi-supply curves) at various points in time over the next 100 years. The research estimates a number of long-term, cumulative, carbon quasi-supply curves under different price scenarios and for different time periods. The curves trace out the relationship between an intertemporal price path for carbon, as given by carbon shadow prices, and the cumulative carbon... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Carbon supply curves; Sequestration; Timber; Forests; Model; Global warming; Prices; Markets; Resource /Energy Economics and Policy; Q10; Q15; Q21; Q23; Q24. |
| Ano: 2001 |
URL: http://purl.umn.edu/10663 |
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| Hein, Lars; Weikard, Hans-Peter. |
| Economic modelling of semi-arid rangelands has received much attention in recent literature. A major outstanding issue is how stochastic rainfall and the feedback effect of heavy grazing pressures on vegetation productivity can be accounted for in these models. This paper presents a model for calculating the optimal livestock stocking rate in a semi-arid rangeland that accounts for stochastic rainfall, the ecological feedback effect and variable prices. The model is developed for rangelands dominated by annual rather than perennial grasses, such as the African Sahel. The feedback effect is modeled on the basis of an ecological study, conducted in northern Senegal, that analyzes the impact of different grazing pressures on vegetation productivity. The paper... |
| Tipo: Journal Article |
Palavras-chave: Semi-arid rangelands; Optimal stocking rate; Modeling rangeland ecology; Sahel; Livestock Production/Industries; Q24; D24. |
| Ano: 2008 |
URL: http://purl.umn.edu/56959 |
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| Eagle, Alison J.; Eiswerth, Mark E.; Johnson, Wayne S.; Schoenig, Steve E.; van Kooten, G. Cornelis. |
| While the significant ecosystem damage caused by invasive weeds has been well documented, the economic impacts of specific invasive weed species are poorly understood. Yellow starthistle (Centaurea solstitialis L., hereafter YST) is the most widespread non-crop weed in California, resulting in serious damage to forage on natural range and improved pasture. A survey was administered to California cattle ranchers to investigate YST infestation rates, loss of forage quantity and value, and control or eradication efforts. The results were used to estimate county-wide economic losses for three focus counties, as well as state-wide economic losses, due to YST in California. Total losses of livestock forage value due to YST on private land for the state of... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Nonnative species; Invasive weeds; Yellow starthistle; Ranching profitability; Forage; Livestock; Crop Production/Industries; Environmental Economics and Policy; Livestock Production/Industries; Q24; Q57. |
| Ano: 2006 |
URL: http://purl.umn.edu/37028 |
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| Barbier, Edward B.. |
| This paper investigates the relationships among land-use change, biological invasion, and interspecific competition in a tropical ecosystem by linking a behavioral model of land conversion by agriculture and an ecological model of interspecific competition between a native species and an exotic invader. The model is used to examine how relative farm prices and access to forest areas influence land clearing and thus the ability of the invasive species to eliminate the native species. Simulations show that only a 20% rise in relative prices and a 2.75% increase in forest access are necessary for this outcome to occur. |
| Tipo: Journal Article |
Palavras-chave: Biological invasion; Interspecific competition; Land clearing; Tropical ecosystem; Tropical forest; O13; Q20; Q24. |
| Ano: 2007 |
URL: http://purl.umn.edu/37275 |
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| Franco, Juan Agustin; Calatrava-Leyva, Javier. |
| En este trabajo se analiza el proceso de adopción del no laboreo en el olivar de la provincia de Granada utilizando información procedente de un sondeo realizado en 2005-2006 a 215 olivicultores. Se analiza en primer lugar el proceso de difusión agregada de las prácticas de no laboreo realizadas en la zona mediante la estimación de varios modelos de difusión temporal. A continuación se identifican, mediante la estimación de dos modelos probit, algunos factores que influyen en la adopción de dichas prácticas. Los resultados obtenidos muestran cómo las prácticas de no laboreo son realizadas por el 90% de los agricultores. Su difusión ha sido intensa desde mediados de los noventa, predominando el efecto imitación, basado en la interacción entre los... |
| Tipo: Journal Article |
Palavras-chave: Erosión; No laboreo; Olivar; Adopción de tecnologías; Difusión de tecnologías.; Agricultural and Food Policy; Q12; Q24; C50.. |
| Ano: 2010 |
URL: http://purl.umn.edu/99605 |
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| Wernstedt, Kris; Heberle, Lauren; Alberini, Anna; Meyer, Peter. |
| This paper provides an overview of the cleanup and redevelopment of contaminated properties known as "brownfields." It has three principal parts. First, we introduce the brownfields phenomenon and its drivers, drawing on the body of available empirical evidence to discuss characteristics of individual brownfield redevelopment projects. Second, we present findings from a recent study we have conducted that examines the relative attractiveness to private developers of public interventions to promote brownfields redevelopment. Third, we briefly summarize some of the problems with brownfields development and policy and propose an approach to promote wider societal benefits of brownfields development. We conclude with several broad questions about brownfields... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Brownfields; Contamination; Economic development; Infill; Environmental Economics and Policy; Q24; Q28. |
| Ano: 2004 |
URL: http://purl.umn.edu/10660 |
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| Wernstedt, Kris; Hersh, Robert. |
| In September of 1994, the Army closed the Fort Ord Military Reservation, a Superfund site of some 28,000 acres located in Monterey County, California. Under the Base Closure and Realignment Act, nearly all of this land will be transferred to federal and state entities and to a number of cities of the Monterey peninsula that border the base. A good deal of this property is valuable real estate -- coastal dunes, golf courses, and barracks that can be converted to apartments or dormitories. For the beneficiaries of these property transfers the Fort Ord cleanup is a modern day gold rush that is taking place as part of a Superfund cleanup. What effect have economic development pressures had on the cleanup process and on decisions about cleanup standards? This... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Superfund; Land use; Economic development; Land Economics/Use; Q24; Q28; R52. |
| Ano: 1997 |
URL: http://purl.umn.edu/10847 |
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| Uchida, Shinsuke. |
| Among multiple slippage effects potentially generated in voluntary land retirement programs, this study attempts to identify one unique source of slippage. Specifically, I examine slippage caused by within-a-farm land conversion from uncultivated land to cropland. With the U.S. Agricultural Census farm-level longitudinal data on land use and enrollment in the Conservation Reserve Program (CRP), I find that an average partial-farm CRP participant converts 25% of noncropland to cropping activities as a consequence of CRP enrollment. Also, an estimated slippage rate varies across farm types and regions. In particular, farms with relatively inelastic crop acreage supply lead to more slippage. Knowledge about the mechanisms through which slippage occurs should... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Conservation Reserve Program; Land use; Land conservation; Slippage.; Agricultural and Food Policy; Land Economics/Use; Q15; Q18; Q24; Q58.. |
| Ano: 2011 |
URL: http://purl.umn.edu/103612 |
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| Nkonya, Ephraim M.; Pender, John L.; Kaizzi, Crammer. |
| This study investigated the linkages between poverty, agricultural productivity and land degradation in Uganda. Results show that farmers in the study region of Uganda deplete about 1.2% of the nutrient stock stored in the topsoil per year, leading to a predicted 0.2% annual reduction in crop productivity. Replacing the depleted nutrients using the cheapest inorganic fertilizers would cost about 20% of farm income on average. Land investments such as soil and water conservation structures and agroforestry trees were found to increase agricultural productivity and reduce land degradation. We observed an inverse farm size crop productivity relationship. Larger families are more productive but use more erosive practices in crop production. Participation in... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries; Land Economics/Use; Q24. |
| Ano: 2006 |
URL: http://purl.umn.edu/25781 |
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| Golub, Alla A.; Hertel, Thomas W.; Sohngen, Brent. |
| The goal of this work is to investigate land-use change at the global scale over the long run particularly in the context of analyzing the fundamental drivers behind land-use related GHG emissions. For this purpose, we identify the most important drivers of supply and demand for land. On the demand side, we begin with a dynamic general equilibrium (GE) model that predicts economic growth in each region of the world, based on exogenous projections of population, skilled and unskilled labor and technical change. Economy-wide growth is, in turn, translated into consumer demand for specific products using an econometrically estimated, international cross-section, demand system that permits us to predict the pattern of future consumer demands across the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Land use; Climate change policy; Baseline; General equilibrium; Agro-ecological zones; C68; R14; Q24; Land Economics/Use. |
| Ano: 2007 |
URL: http://purl.umn.edu/9910 |
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| Sedjo, Roger A.; Toman, Michael. |
| An RFF Workshop brought together experts from around the world to assess the feasibility of using biological sinks to sequester carbon as part of a global atmospheric mitigation effort. The chapters of this proceeding are a result of that effort. Although the intent of the workshop was not to generate a consensus, a number of studies suggest that sinks could be a relatively inexpensive and effective carbon management tool. The chapters cover a variety of aspects and topics related to the monitoring and measurement of carbon in biological systems. They tend to support the view the carbon sequestration using biological systems is technically feasible with relatively good precision and at relatively low cost. Thus carbon sinks can be operational. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Carbon; Sinks; Global warming; Sequestration; Forests; Environmental Economics and Policy; Q10; Q15; Q21; Q23; Q24. |
| Ano: 2001 |
URL: http://purl.umn.edu/10480 |
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| Registros recuperados: 157 | |
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