The illustrated diagram outlines the process of manufacturing a biofuel named ethanol. Generally speaking, we can see that this process mainly involves both chemical and biological steps.
The process begins with the growth of various trees and plants, which obtain energy to grow through photosynthesis, consuming carbon dioxide and sunlight from the atmosphere. Next, they are harvested by special machines and then sent to the pre-processing stage, where they are broken down into cellulose strands. In the next step, the cellulose strands are chemically transformed into sugar molecules.
Following this, sugar molecules are converted into ethanol through the addition of microbes. Then, the produced ethanol is used as a biofuel to power vehicles, such as cars, trucks, or planes. Ultimately, the use of these vehicles burns the ethanol, releasing carbon dioxide into the atmosphere. The carbon dioxide is then absorbed by trees and plants during photosynthesis, restarting the cycle again.