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| a substance that provides the energy needed to power engines |
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| material from living or recently living organisms or their by-products |
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| biomass sources used to make biofuels |
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| plants that live for more than a year, growing and producing seed year after year |
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| plants that live for a year, produce seed, and then die |
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| crops specifically grown to be used to produce biofuels |
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| an alcohol fuel made from crops like corn and sugarcane in a process of fermentation and distillation |
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| a liquid fuel made from vegetable oil, animal fats, or waste oil that can be used directly in diesel internal combustion machine |
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| farming method in which one variety of one crop is planted typically in rows over large areas with large inputs of fertilizer, pesticides, and water |
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| bioethanol made by breaking down cellulose in plants; a difficult process that has yet to be scaled up to meet large production goals |
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| the storage of carbon in a form that does not readily release the carbon to the atmosphere or water |
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| the amount of carbon released during the first 50 years of land cleaning for the biofuel feedstocks |
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| a variety of materials, such as wood, dried manure, and crop waste, can be burned directly. This is the most common energy source in less developed regions of the world but can lead to problems such as deforestation, and air pollution |
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| biomass can also be converted to other forms and then burned. This produces more energy-rich fuels that are less bulky than the original biomass; these fuels also burn more cleanly (less particulate matter) than the original forms and can fuel engines that currently run on gasolineor diesel fuel. |
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| Garbage and agricultural, industrial, and food waste can be used to create a variety of biofuels. |
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