The diagram illustrates the eight main steps of the cyclical process of producing ethanol, which is a type of biofuel.
Overall, the process begins with the cultivation of plants and the final step is producing a biofuel, which is used in transportation.
At first, plants and trees provide their needed energy for growth by absorbing sunlight and carbon dioxide. Once the plants fully-grown, they are harvested using agricultural equipment. Then, a special machinary is used to break the vegetation to cellulose, a raw material for producing ethanol.
In the next stage, the cellulose is processed in the laboratory to extract its sugar contents. Afterwards, micoorganisms, such as microbes, are incorporated into sugars to be fermented so that the final product is produced. Ethanol is used as a fuel for cars, lorries, and airplanes. These vehicles emit carbon dioxide that can be used by plants to trigger the explained process to start over.