To put it shortly, the diagram is a quick representation of a complex process. It depicts how exactly the gass called ethanol is produced.
First things first, the material needs to be collected – trees and other greens are being harvested. Then right after the delivery pre-processing starts. Celulose made out of deliberatetly selected material is soon to be processed once again. Soon enough raw substance is going to be separated into different sugars. Production also requiers use of specific microbes. And so, this is the final step after which the fuel is ready for its purpose which is expremely comfortable since it is commonly used for different vehicels. While using petrol we should also pay attention to the side product we recieve – the carbon dioxide. And this exact gass is what helps trees grow faster.
Therefore, we me conclude that production of ethanol is a cycle that not only provides needed fuel but also benefitially provides oportunity to reuse side product for better trees’ growth.