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| Biogas
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A combustible gas created by anaerobic decomposition of organic material, composed primarily of methane, carbon dioxide, and hydrogen sulfide. |
| Biogasification or biomethanization
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The process of decomposing biomass with anaerobic bacteria to produce biogas. |
| Biological pest control
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Using living organisms such as beneficial insects or parasites to destroy garden pests. |
| Biomass
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As defined by the Energy Security Act (PL 96-294) of 1980, "any organic matter which is available on a renewable basis, including agricultural crops and agricultural wastes and residues, wood and wood wastes and residues, animal wastes, municipal wastes, and aquatic plants.". |
| Biomass fuel
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Biomass converted directly to energy or converted to liquid or gaseous fuels such as ethanol, methanol, methane, and hydrogen. |
| Biomass gasification
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The conversion of biomass into a gas, by biogasification or thermal gasification, in which hydrogen is produced from high-temperature gasifying and low-temperature pyrolysis of biomass. |
| Biophotolysis
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The action of light on a biological system that results in the dissociation of a substrate, usually water, to produce hydrogen. |
| Bird bath
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Small, inconsequential amounts of water on a roof that quickly evaporate. |
| Bird screen
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Wire mesh installed over openings in order to prevent birds from entering a building or roof cavity. |
| Bird's mouth cut
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Cut that resembles the open mouth of a bird, which is made in the end of a rafter so that the rafter joints are snug with the top wall plate. |
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