The figure illustrates how ethanol is created.
Overall
, Linking Words
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. Linking Words
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. Linking Words
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. Linking Words
Subsequently
, microbes are added, Linking Words
thus
creating ethanol. Linking Words
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.Linking Words
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