| 1. |
- Berndes, Göran, 1966, et al.
(författare)
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Bioenergy and land use change-state of the art
- 2013
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Ingår i: Wiley Interdisciplinary Reviews: Energy and Environment. - : Wiley. - 2041-8396 .- 2041-840X. ; 2:3, s. 282-303
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Forskningsöversikt (refereegranskat)abstract
- Bioenergy projects can lead to direct and indirect land use change (LUC), which can substantially affect greenhouse gas balances with both beneficial and adverse outcomes for bioenergy's contribution to climate change mitigation. The causes behind LUC are multiple, complex, interlinked, and change over time. This makes quantification uncertain and sensitive to many factors that can develop in different directions-including land use productivity, trade patterns, prices and elasticities, and use of by-products associated with biofuels production. Quantifications reported so far vary substantially and do not support the ranking of bioenergy options with regard to LUC and associated emissions. There are however several options for mitigating these emissions, which can be implemented despite the uncertainties. Long-rotation forest management is associated with carbon emissions and sequestration that are not in temporal balance with each other and this leads to mitigation trade-offs between biomass extraction for energy use and the alternative to leave the biomass in the forest. Bioenergy's contribution to climate change mitigation needs to reflect a balance between near-term targets and the long-term objective to hold the increase in global temperature below 2 degrees C (Copenhagen Accord). Although emissions from LUC can be significant in some circumstances, the reality of such emissions is not sufficient reason to exclude bioenergy from the list of worthwhile technologies for climate changemitigation. Policy measures to minimize the negative impacts of LUC should be based on a holistic perspective recognizing the multiple drivers and effects of LUC.
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| 2. |
- Börjesson, Pål, et al.
(författare)
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The climate benefit of Swedish ethanol: Present and prospective performance
- 2012
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Ingår i: Wiley Interdisciplinary Reviews: Energy and Environment. - : Wiley. - 2041-8396 .- 2041-840X. ; 1:1, s. 81-97
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Forskningsöversikt (refereegranskat)abstract
- Biofuels are introduced in the transportation sector as a means to reduce the sector'ns greenhouse gas (GHG) emissions. European and other national and global standardization schemes for biofuels also include certain minimum GHG emission reduction among the requirements to be met. Assessments of the GHG performance of biofuels are complex due to the complexities of physical, chemical, and biological conversion processes, feedstock diversity, and variability in site-specific environmental conditions. Differences may also arise in analytical approaches, including in how direct and indirect land use change is accounted for. Current production of first-generation ethanol in Sweden, based on wheat, causes relatively low GHG emissions, whereas a future expansion may cause increased emissions from changes in land use and less optimal utilization of by-products. Such negative impacts may be avoided by an introduction and expansion of second-generation ethanol based on lignocellulosic feedstock (e.g., straw, short rotation coppice, and forest residues), which eventually could become the major feedstock in ethanol production. This transition to low, indirect impact ethanol systems creates an opening for a significant expansion of ethanol in the transport sector without compromising the sizeable climate benefits and sustainable resource exploitation.
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| 3. |
- Cintas Sanchez, Olivia, 1982, et al.
(författare)
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The climate effect of increased forest bioenergy use in Sweden: evaluation at different spatial and temporal scales
- 2016
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Ingår i: Wiley Interdisciplinary Reviews: Energy and Environment. - : Wiley. - 2041-8396 .- 2041-840X. ; 5:3, s. 351-369
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Tidskriftsartikel (refereegranskat)abstract
- Bioenergy from boreal forests managed for productive purposes (e.g., pulp, timber) is commonly held to offer attractive options for climate change mitigation. However, this view has been challenged in recent years. Carbon balances, cumulative radiative forcing, and average global temperature change have been calculated for a variety of bioenergy management regimes in Swedish forests and the results support the view that an increased use of forest biomass for energy in Sweden can contribute to climate change mitigation, although methodological (e.g. spatial scales) and parameter value choices influence the results significantly. We show that the climate effect of forest-based bioenergy depends on the forest ecosystems and management, including biomass extraction for bioenergy and other products, and how this management changes in response to anticipated market demands; and on the energy system effects, which determine the fossil carbon displacement and other greenhouse gas (GHG) mitigation effects of using forest biomass for bioenergy and other purposes. The public and private sectors are advised to consider information from comprehensive analyses that provide insights about energy and forest systems in the context of evolving forest product markets, alternative policy options, and energy technology pathways in their decision-making processes.
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| 4. |
- Egnell, Gustaf
(författare)
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Options for increasing biomass output from long-rotation forestry
- 2013
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Ingår i: Wiley Interdisciplinary Reviews Energy and Environment. - : Wiley. - 2041-8396 .- 2041-840X. ; 2, s. 465-472
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Tidskriftsartikel (refereegranskat)abstract
- Forests managed by long-rotation forestry already play an important role as a source for renewable biomass and energy. The biomass output from these forests may be increased through higher harvest levels, but to be sustainable over time, harvest levels cannot exceed forest growth. A large proportion of the tree biomass (tops, foliage, branches, stumps, and small and unmerchantable trees) is left on the logging site in conventional stemwood harvest, representing a considerable amount of available biomass. The realizable biomass potential is lower, due to environmental and techno-economic constraints. If more technically adapted, efficient, and environmentally friendly biomass harvest and transport systems are developed, the realized biomass potential can be considerably increased. By complementing current stemwood harvesting technologies with systems that include logging residues, stumps, and small trees, a larger proportion of the potential will be available. In a longer term, increased forest growth can raise the biomass output. Many silvicultural treatments are available, including improved site preparation, vegetation control, insect control, browser control, genetically improved seedlings, fast growing tree species, fertilization, irrigation, denser stands, and so on. Inexpensive silvicultural measures that can be applied on large areas at a fast rate, such as using genetically improved seedling stock, have the highest potential to increase total forest production. Because of the long-rotation periods, it will take decades to make a difference in forest production and thereby in the biomass output potential. In addition, a more efficient use of biomass in both forest and energy industries and in biorefineries of the future holds potential. © 2012 John Wiley & Sons, Ltd.
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| 5. |
- Ekergård, Boel, et al.
(författare)
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Experimental results from a linear wave power generator connected to a resonance circuit
- 2012
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Ingår i: Wiley Interdisciplinary Reviews. - : Wiley. - 2041-8396 .- 2041-840X. ; 2:4, s. 456-464
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Tidskriftsartikel (refereegranskat)abstract
- The output voltage from a direct-driven permanent magnet linear generator installed in a wave power plant varies both in amplitude and frequency. Electrical conversion is therefore necessary before grid connection can be achieved. The aim of this paper is to present an electrical conversion system based on the electric resonance phenomena. As one of the first steps in the development, and to gain further knowledge and understanding of the proposed resonance circuit, experimental tests with a single-phase permanent magnet linear generator connected to a resonance circuit were performed. The experimental results presented in this paper indicated that a successful resonance between the generator and external circuit was achieved. The research regarding the wave energy converters lies within The Lysekil Wave Power Project at Uppsala University and has been ongoing since 2002.
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| 6. |
- Englund, Oskar, 1982, et al.
(författare)
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How do sustainability standards consider biodiversity?
- 2015
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Ingår i: Wiley Interdisciplinary Reviews: Energy and Environment. - : Wiley. - 2041-8396 .- 2041-840X. ; 4:1, s. 26-50
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Tidskriftsartikel (refereegranskat)abstract
- Sustainability certification schemes and standards are meant to prevent a range of unacceptable socioeconomic and environmental consequences, such as threats to biodiversity. While there is wide support for conserving biodiversity, opera- tionalizing this support in the form of guiding principles, criteria/indicators, and legislation is complicated. This study investigates how and to what extent 26 sustainability standards (eleven for forest management, nine for agriculture and six biofuel-related) consider biodiversity, by assessing how they seek to prevent actions that can threaten biodiversity as well as how they support actions aimed at biodiversity conservation. For this purpose, a benchmark standard was developed, meant to represent a case with very high ambitions concerning biodiversity con- servation. Of the assessed standards, the biofuel-related standards demonstrated the highest level of compliance with the benchmark. On average, they complied with 72% of the benchmark’s component criteria, compared to 61% for the agricul- tural standards and 60% for the forestry standards. Fairtrade, Sustainable Agricul- ture Network/Rainforest Alliance (SAN/RA), Roundtable on Sustainable Palm Oil (RSPO), and Roundtable on Responsible Soy (RTRS) were particularly stringent, while Green Gold Label S5 (GGLS5), PEOLG, Global Partnership for Good Agricul- tural Practices (GLOBALGAP), European Union Organic (EU Organic), National Organic Program (NOP), Green Gold Label S2 (GGLS2), and International Sus- tainability & Carbon Certification (ISCC) were particularly unstringent. All eleven forestry standards, six of the nine agricultural standards, and all six biofuel-related standards addressed ecosystem conversion, ranging from requiring that high con- servation value areas be identified and preserved to requiring full protection. Finally, key barriers to, and challenges for, certification schemes are discussed and recommendations are made for further development of sustainability standards.
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| 7. |
- Englund, Oskar, et al.
(författare)
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Multifunctional perennial production systems for bioenergy: performance and progress
- 2020
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Ingår i: Wiley Interdisciplinary Reviews. - : Wiley. - 2041-8396 .- 2041-840X.
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Tidskriftsartikel (refereegranskat)abstract
- As the global population increases and becomes more affluent, biomass demands for food and biomaterials will increase. Demand growth is further accelerated by the implementation of climate policies and strategies to replace fossil resources with biomass. There are, however, concerns about the size of the prospective biomass demand and the environmental and social consequences of the corresponding resource mobilization, especially concerning impacts from the associated land-use change. Strategically integrating perennials into landscapes dominated by intensive agriculture can, for example, improve biodiversity, reduce soil erosion and nutrient emissions to water, increase soil carbon, enhance pollination, and avoid or mitigate flooding events. Such ?multifunctional perennial production systems? can thus contribute to improving overall land-use sustainability, while maintaining or increasing overall biomass productivity in the landscape. Seven different cases in different world regions are here reviewed to exemplify and evaluate (a) multifunctional production systems that have been established to meet emerging bioenergy demands, and (b) efforts to identify locations where the establishment of perennial crops will be particularly beneficial. An important barrier towards wider implementation of multifunctional systems is the lack of markets, or policies, compensating producers for enhanced ecosystem services and other environmental benefits. This deficiency is particularly important since prices for fossil-based fuels are low relative to bioenergy production costs. Without such compensation, multifunctional perennial production systems will be unlikely to contribute to the development of a sustainable bioeconomy.
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| 8. |
- Funkenbusch, Li Lu T., et al.
(författare)
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Technoeconomic assessment of hydrothermal liquefaction oil from lignin with catalytic upgrading for renewable fuel and chemical production
- 2019
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Ingår i: Wiley Interdisciplinary Reviews: Energy and Environment. - : Wiley. - 2041-8396 .- 2041-840X. ; 8:1
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Forskningsöversikt (refereegranskat)abstract
- Lignin is a readily available by-product of the Kraft pulping process, and may be processed via hydrothermal liquefaction (HTL) to produce a bio-oil suitable for cofeeding into a petroleum refinery hydrotreatment unit. HTL of lignin is performed in near-critical water and, in addition to the bio-oil, produces an aqueous organic and solid char phase. The aqueous organics are primarily phenolics, which may be converted into valuable coproducts via liquid–liquid extraction and hydrotreatment to benzene, toluene, ethylbenzene, and xylenes (BTEX) compounds. Three technological scenarios were developed: a current technology case, a state-of-the-art research case, and an optimal case based on product targets provided by refiners. For a large Kraft pulp mill (400 metric tons/day of dry lignin), a renewable fuel production of 65–70 million L/year, with capital costs of $114–125 million and a final per liter cost of $0.41–0.44 were estimated. The BTEX coproduct yield ranged from 16.8–18.0 million L/year. An economic analysis of the process revealed that the hydrotreatment steps have the highest installed capital costs, while the liquid–liquid extraction process is the largest operating cost. Based on these results, the minimum selling price (MSP) of the biofuel is between $3.52 and $3.86/gallon, and the MSP of BTEX is between $1.65 and $2.00 per liter. With current technology, coproduction of BTEX does not offset the cost of biofuel production. Improved technology to further lower bio-oil oxygen content and decrease both capital and operating costs are needed to make HTL-based fuels competitive with fossil fuel-based options. This article is categorized under: Energy Research & Innovation > Science and Materials Bioenergy > Economics and Policy Bioenergy > Systems and Infrastructure.
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| 9. |
- Grahn, Maria, 1963, et al.
(författare)
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Prospects for domestic biofuels for transport in Sweden 2030 based on current production and future plans
- 2015
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Ingår i: Wiley Interdisciplinary Reviews: Energy and Environment. - : Wiley. - 2041-8396 .- 2041-840X. ; 4:3, s. 290-306
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Forskningsöversikt (refereegranskat)abstract
- Currently, Sweden has the largest share of renewable fuels for transport in the EU. The ambition of the Swedish Government for 2030 is for a vehicle fleet independent of fossil fuels. This paper assesses the potential future contribution of domestically produced biofuels for transport in Sweden to 2030, based on a mapping of the prospects from the actual and potential Swedish biofuel producers. There are plans for cellulose-based ethanol, methanol, DME, methane, and the biodiesel option HVO. Continued domestic production of biofuels at current levels, and the realization of all the ongoing mapped plans for additional biofuels production, results in a potential domestic biofuels production of 18 TWhfuel in 2023. When assuming a continued expansion of biofuels production capacity, the potential domestic biofuels production reaches about 26 TWh(fuel) in 2030. If the realization of the mapped biofuels plans is delayed by 5 years and the pace of continued implementation of additional biofuel capacity is also reduced, the potential domestic biofuels production is reduced to about 8 TWh(fuel) and 20 TWh(fuel) biofuels in 2020 and 2030, respectively. These two scenarios correspond to a share of biofuels of the total future energy demand for road transport in Sweden at about 10-30% in 2020 and 26-79% in 2030, depending on which official energy demand scenario is used. The actual contribution of biofuels for road transport will depend on, e.g., policies, the global development for fossil fuels and biofuels, the competition for biomass and biofuels, and future energy demand in the road transport sector.
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| 10. |
- Hansson, Julia, 1978, et al.
(författare)
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The potential influence of sustainability criteria on the European Union pellets market—the example of Sweden
- 2016
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Ingår i: Wiley Interdisciplinary Reviews: Energy and Environment. - 2041-8396 .- 2041-840X. ; 5:4, s. 413-429
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Tidskriftsartikel (refereegranskat)abstract
- The introduction of sustainability criteria for solid biomass/biofuels on the European Union (EU) or global level may influence the EU pellets market, e.g., by limiting the eligible biomass supply potential or specific pellet chains. This assessment focuses on greenhouse gas (GHG) emission reductions and the issue of sustainable forest management (SFM) for pellets potentially used in Sweden(for residential and/or industrial use). The paper includes (1) a literature review of recent studies addressing the impact of sustainability requirements (for solid biomass and/or liquid biofuels) on the bioenergy market, (2) a characterization of SFM conditions in potential pellets export countries and their capacity to enforce respective legislation, and (3) an assessment of GHG emissions for heat and electricity for the Swedish market from selected potential wood pellet chains (including torrefaction) and related GHG emissions reduction compared to fossil fuelsusing a life cycle assessment perspective. Most of the assessed wood pellet value chains will most likely be able to meet stringent sustainability requirements from a GHG perspective. Thus, the impact of near-term GHG emission reduction demands on the Swedish pellets market is limited. More specifically, we find that torrefaction may be advantageous for pellets imported over long distances (i.e.,over approximately 18,500 km). We conclude that demand for SFM related to solid biofuels will not have a significant or long-lasting effect on the market for Swedish pellets. The real impacts of sustainability requirements will howeverdepend on levels of ambition as well as the methodologies and systems boundaries applied in future systems.
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