The diagram below shows how a biofuel called ethanol is produced. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
The figure illustrates how ethanol is created.
Overall
, it is clear that
it is a cyclical, man-made process that contains ten stages. It starts with the absorption of energy by trees and plants and ends with the release of carbon dioxide by cars, aeroplanes and trucks. Furthermore
, during a specific part of the process, microbes are added.
Looking at the first four stages, we can see that the plants and trees absorb energy that contains carbon dioxide and sunlight. Once they are grown, they are harvested by humans. Then
, they are pre-processed in machines and are turned into cellulose.
In the fifth stage, the cellulose produced is processed and transformed into sugars. Subsequently
, microbes are added, thus
creating ethanol. Finally
, the biofuel produced is used as fuel for three different transportation modes, which are going to release carbon dioxide into the air. The latter will be absorbed by the trees and plants and the cycle will start again.Submitted by santos_dij on
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