The diagram provided illustrates how the process of making ethanol, a type of biofuel product is carried out.
Overall it can be seen that not only is the process cyclic, but it also consists of nine distinct steps, such as accumulation of energy, which then is turned into cellulose and it ends with produced ethanol being used by various means of transport.
The first four steps involve the transformation of a raw material. Initially, plants and trees absorb energy, which is a combination of sunlight and carbon dioxide from the atmosphere. After this, a grown vegetation is harvested by agricultural machinery and then conveyed into a chipping machine. After having done this process, cellulose is extracted ready for the next stage.
The remaining steps produce biofuel named ethanol. The collected amount of cellulose undergoes a chemical process to create sugars and it is followed by a step where sugars are combined with microbes, resulting in ethanol, which is utilized to power vehicles including cars, trucks, and aircrafts. These vehicles in turn release carbon dioxide into the air, resulting plants and trees absorb it, which leads to the renewing of cycle.