The given diagram illustrates the different steps in the circular process of producing a type of biofuel called ethanol.
Overall, it is evident the entire procedure consists of eight main stages, starting from the growth of essential vegetation and ending with the utilization of ethanol in the transportation industry.
Specifically, the cycle begins by the comprising of the available sunlight and carbon dioxide in the atmosphere, which then creates a necessary source of energy for the development of trees and plants. After reaching a certain level of maturity, trees are mechanically harvested before being put into a pre-processing machine to extract strands of cellulose.
In the next step, the broken down materials are then chemically processed to turn into sugars, which are combined with microbes, resulting in the creation of ethanol. This chemical is mostly used in fossil fuel production for the operation of different types of transport, including automobiles, trucks and airplanes, before being released back into the atmosphere through gas emission. The vegetation then, again, absorbs this as energy, and the cycle restarts.