The diagram illustrates the process of producing ethanol, a type of biofuel., Overall, ethanol production is a cyclical process involving plants, processing and fuel consumption., The process begins with plant growth and ends with carbon dioxide being reabsorbed by plants., Initially, plants and trees grow by using sunlight and carbon dioxide., Once mature, they are harvested for further processing., The harvested material is then pre-processed into smaller pieces., After that, cellulose is extracted from the biomass., The cellulose undergoes industrial processing., As a result, sugars are produced., Microbes are then added to the sugars., This stage converts the material into ethanol., The finished biofuel can be used by vehicles such as cars, trucks and aircraft., When ethanol is burned, carbon dioxide is released into the atmosphere., Additional carbon dioxide is also emitted during pre-processing., However, this gas is absorbed by growing plants., The cycle then continues as new biomass is produced., Overall, ethanol is generated through a renewable cycle linking plants, fuel production and energy use.

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