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 given diagram

is illustrating

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illustrates

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the production

process

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of a biofuel

which

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, which

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is referred to as ethanol.

Overall

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, it is evident that the

process

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is cyclical, involving the growth of plants, their conversion into ethanol and the use of

this

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fuel for vehicles.

Carbon

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dioxide

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released

during

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During

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the

process

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is absorbed by plants, completing the cycle. Trees grow with sunlight and the

carbon

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dioxide

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they absorb from the air. After the harvest of grown trees, they undergo the initial stage known as pre-processing.

As a result

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of

this

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stage, a substance called cellulose is obtained. When cellulose is ready for the “processing” stage, it is processed into sugars. Once the

process

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has finished, microbes are

then

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added to the sugars to produce ethanol.

This

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fuel is used in cars, trucks and aircraft, which release

carbon

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dioxide

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into the atmosphere.

This

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carbon

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dioxide

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is

then

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absorbed by plants and trees

and

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, and

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the cycle restarts.