The image outlines the process whereby a type of biofuel named ethanol is produced. Generally speaking, the process is cyclical and is divided into two groups of stages: production and consumption. There are a total of approximately seven different stages in a single cycle of obtaining and using ethanol, requiring human as well as natural interference, scientific knowledge and specialized equipment.
The production of this biofuel consists of around five stages. It starts with plants and trees growing with the influence of a natural process called photosynthesis. These are then harvested using farming machinery, which is followed by the stage called pre-processing when biomass is converted into cellulose. Subsequently, this substance is broken down into sugars in the stage called processing that happens in a laboratory. In the last phase, these sugars are fed to microbes, which then produce ethanol.
The consumption stage in the cycle is relatively straightforward. The produced ethanol serves as a source of energy for a wide range of motor vehicles, such as planes, trucks and automobiles. They burn ethanol and discharge carbon dioxide into the atmosphere. This gas, together with sunlight, serves as an energy source for plants and trees, repeating the cycle.