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At first glance, renewable fuels are attractive from an environmental and sustainability perspective and cogent arguments have been made that such considerations justify the generous tax remission protocols necessary to commercialize these products. For example, the use of renewable fuels in urban vehicles may be justified if the emissions are much cleaner than those from conventionally fuelled vehicles.Cereal straw and other dry byproducts (wood chips) may be used in small on-farm boilers typically to generate heat for drying harvested crops (cereals, oilseeds) or space heating (greenhouses, residential). Furthermore, biogas (predominantly methane) generated from animal wastes (e.g. pig slurry) by anaerobic digestion may also be used to power on-farm boilers typically to generate heat and also electricity in larger and more sophisticated installations.