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 presents the

process

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of biofuel (

ethanol

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) production.

Overall

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, the whole

process

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is looped, starting when

plants

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and

trees

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absorb energy from the atmosphere and ending when

ethanol

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is used by vehicles, converting the biofuel into

carbon

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dioxide

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again.

Firstly

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,

plants

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and

trees

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grow by consuming energy which is sunlight and

carbon

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dioxide

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from the environment. After they grow, a harvesting

process

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begins. In the next step, the

trees

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and

plants

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are pre-processed, being transformed into cellulose before entering the main processing stage. In the processing step, the cellulose becomes sugars.

Then

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, microbes are added, making

ethanol

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as a final product. The

ethanol

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produced will be used as a biofuel for various vehicles, including cars, trucks, and planes. These vehicles burn

ethanol

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and release

carbon

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dioxide

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into the air.

Finally

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,

carbon

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dioxide

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is captured by

trees

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and

plants

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as their energy for growth. The whole

process

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starts again at

this

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step.