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 diagram illustrates the 7 steps of biofuel production, named as

ethanol

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.

Overall

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, it is evident that

,

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it is a cyclic process. The cycle starts with the combination of sunlight and

Co2

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CO2

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to produce

ethanol

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and

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, and

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then

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ethanol

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used

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is used

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as a

biofuel

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biofuel,

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is

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then

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converted into

Co2

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CO2

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and

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, and

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mixes with the atmosphere again. To start with, plants and trees absorb energy from sunlight and carbon dioxide to grow. Those well-grown plants are harvested and

undergoes

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undergo

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a pre-processing stage to form

a

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cellulose. Afterwards, it is processed in the laboratory to produce sugar molecules. Later, some microbes are introduced into the sugars to go through a chemical reaction, so

ethanol

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is formed.

This

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compound is used as renewable energy to run

vechicles

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vehicles

such

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as

,

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apply

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cars, trucks and aeroplanes. As these motors run, they emit

Co2

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CO2

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which

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, which

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then

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gets absorbed into the atmosphere again

and

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, and

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the cycle continues.