Band 6+: The diagram below shows how a biofuel called ethanol is produced. Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

The given diagram depicts the process of producing ethanol.

Overall, the manufacturing process is a closed-loop system divided into three main stages, commencing with CO2 and sunlight absorption, production, and consumption of ethanol, and culminating with CO2 release and return back to the environment.

At the beginning of the first stage, the energy from sunlight and carbon dioxide is absorbed and stored by plants, this process is called photosynthesis. After that, these trees are harvested. Then the harvested products undergo pre-processing manufacturing and they are broken down and crushed to become strands of cellulose which is the key component of ethanol production.

After these steps, they extract cellulose and create a chemical transformation to convert it into sugar. Microbes are added to turn it into ethanol, then these products are used as a fuel for the vehicles that use combustion energy to run such as planes, cars, trucks.

At the final stages, during combustion carbon dioxide is emitted back into the atmosphere. The plants and trees reabsorb them and restart the cycle. This closed loop system ensure the sustainable energy sources for people to use and minimized the carbon emission caused by fuel comsumption.