The given picture describes the process of generating a biofuel known as ethanol.
Overall, this process is comprised of ten key steps, beginning with the absorption of energy into vegetation and ending with carbon dioxide being emitted into the air.
Initially, the energy from sunlight and carbon dioxide helps facilitate the growth of plants and trees. Once these plants are fully grown given the absorbed energy, they are harvested for production. Thereafter, garnered plants experience a pre-processing stage wherein they are converted into small segments before being turned into cellulose.
The process continues with the processing phase, in which cellulose is transformed into sugars via chemical reactions. The newly-made product is fed with microbes to create the desired compound, ethanol. This biofuel is then utilized to fuel different types of transportation, mainly cars, trucks and planes. These three typical vehicles discharge carbon dioxide back into the environment. The released gas subsequently starts the new cycle of the process over again.