The figure illustrates the process of producing a biofuel known as ethanol.
Overall, This cycle for biofuel production involves three main stages: harvesting and preparing plant material for processing, producing ethanol by chemical processing, then using the fuel for transportation, before the cycle begins again.
First of all, plants and trees are the primary source of ethanol and require sunlight and carbon dioxide in order to grow. After that, the plants are harvested and prepared for the pre-processing stage, where the raw materials are converted into cellulose.
Next, the cellulose is processed to produce sugars. In the final stage, microbes are added, leading to the production of ethanol, which is ready for use. Ethanol is mainly used as fuel for cars, trucks, and planes, and the carbon dioxide released from these vehicles contributes to the energy cycle that supports plant growth.