The illustration below depicts the production of a biofuel called ethanol .
Overall , The 10 step ethanol production process starts with the absorption of energy by planets and ultimately producing ethanol from which we can run vehicles and finally those byproducts produced by the vehicles act as energy for plants combining with sunlight .
At the initial step , The plants absorb the energy from the environment and boost their growth becoming mature . Then those grown plants and trees are harvested using dozers or other equipment . The harvested plants goes for a pre processing process from which the important raw material for ethanol is produced which is called cellulose .
Now , the cellulose goes through processing and generates sugars . Finally ethanol is produced when the microbes are added to these generated sugars . Airplanes, bus and cars are run through this biofuel called ethanol .Finally the byproduct produced by these vehicles that is carbon dioxide finally get released in the environment and which is again used by plants in the presence of sun light for growth . In this way the cyclic process continues .