The diagram illustrates the process of ethanol production.
Overall, it is a man-made, cyclical process consisting of eight main stages, beginning with plants and trees as raw materials and ending with the production of biofuel used by vehicles.
Initially, plants and trees absorb carbon dioxide from the atmosphere. Following this, they are harvested by humans. Subsequently, the raw material is crushed by machines and is converted into cellulose.
Once this stage is completed, the cellulose is transported to a factory, where it is processed into a sugar mixture. At a later stage, microbes are added to this mixture, which results in the production of ethanol.
At a later stage, microbes are added to the mixture, which results in the production of ethanol. In the final stage, ethanol is used as fuel for vehicles, and carbon dioxide is released back into the atmosphere, allowing new plants to grow and completing the cycle.