The picture illustrates the production of Ethanol, a biofuel that can be used on various types of vehicles. There are steps that are necessary to make the product, as we shall see.
The first step is to harvest the trees as the raw material and load them into a truck that will transport them to the pre-processing machine, which will extract the cellulose out of the trees. Then, the cellulose itself will be processed under chemical reactions that result in sugars.
The next step is to add microbes to transform the sugars atomic bond at the molecule level. The process results in ethanol that can be used as a biofuel for vehicles such as cars, trucks, and airplanes. It is essential to remember that the waste product of diesel engines is carbon dioxide. It is the same substance that helps trees grow, excluding sunlight. The cycle continues as the process repeats.