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these types affects the optimal exploitation policies. When uncertainty is due to our ignorance of some aspects of the underlying ecology, the isolated equilibrium states characterizing optimal exploitation for many renewable resource problems become equilibrium intervals, giving rise to hysteresis phenomena. Events triggered by genuinely stochastic environmental conditions... Tipo: Working or Discussion Paper Palavras-chave: Ecosystem; Resource management; Event uncertainty; Biodiversity; Extinction; Resource /Energy Economics and Policy. Ano: 2004 URL: http://purl.umn.edu/14996 U.S. Biodiesel Development: New Markets for Conventional and Genetically Modified Agricultural Products Provedor de dados: 31 Autores: Duffield, James A.; Shapouri, Hosein; Graboski, Michael S.; McCormick, Robert; Wilson, Richard. With environmental and energy source concerns on the rise, using agricultural fats and oils as fuel in diesel engines has captured increasing attention. Substituting petroleum diesel with biodiesel may reduce air emissions, increase the domestic supply of fuel, and create new markets for farmers. U.S. agricultural fats and oils could support a large amount of biodiesel, but high production costs and competing uses for biodiesel feedstocks will likely prevent mass adoption of biodiesel fuel. Higher-priced niche markets could develop for biodiesels as a result of environmental regulations. Biodiesel has many environmental advantages relative to petroleum diesel, such as lower CO, CO2, SOx, and particulate matter emissions. Enhancing fuel properties by... Tipo: Report Palavras-chave: Biodiesel; Biodiesel blends; Fatty acid esters; Soybean; Oil crops; Animal fats; Plant genetics; Diesel engines; Alternative fuels; Resource /Energy Economics and Policy. Ano: 1998 URL: http://purl.umn.edu/34029 The Growth and Direction of the Biodiesel Industry in the US Provedor de dados: 31 Autores: Ginder, Roger G.; Paulson, Nicholas D. Tipo: Conference Paper or Presentation Palavras-chave: Resource /Energy Economics and Policy. Ano: 2006 URL: http://purl.umn.edu/21402 Forest Certification: Toward Common Standards? Provedor de dados: 31 Autores: Fischer, Carolyn; Aguilar, Francisco X.; Jawahar, Puja; Sedjo, Roger A. The forestry industry provides a good illustration of the active roles that industry associations, environmental nongovernmental organizations (NGOs), national governments, and international organizations can play in developing and promoting codes of conduct that are formally sanctioned and certified. It also reflects some of the challenges of disseminating codes of conduct in developing countries and ensuring market benefits from certification. We describe the emergence of forest certification standards, outline current certification schemes, and discuss the role of major corporations in creating demand for certified products. We also discuss the limited success of certification and some of the obstacles to its adoption in developing countries. The... Tipo: Working or Discussion Paper Palavras-chave: Forest certification; Codes of conduct; Forest Stewardship Council; PEFC; Sustainable Forestry Initiative; Sustainable forest management; Resource /Energy Economics and Policy; Q23; Q56; L73; Q13.