The given diagram illustrates the production of a biofuel named ethanol.
Overall, the cycle consists of nine main stages, beginning with plants absorbing sunlight and carbon dioxide and ending with the generation and distribution of ethanol.
Initially, carbon dioxide formed by human transportation and sunlight is absorbed by growing plants as a source of nutrient components for growth. Then, the plant is harvested manually and put into a grinder for pre-processing. Once the plants have been ground into small pieces, it produces cellulose.
The remaining stages involve chemical reactions. First of all, the primarily processed material is sent to the laboratory for further processing. In the following step, certain types of sugars are refined. Afterwards microbes are added to ferment with sugars. Finally, ethanol is produced through microbial metabolism and being used by vehicles such as airplanes, trucks, and cars. The carbon dioxide released by transportation is then inhaled again by the plants and completes the cycle.