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 manufacturing process of a biofuel named

ethanol

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.

Overall

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, the process involves four main stages. In the beginning, with the natural energy resources like sunshine and CO2(carbon dioxide),

ethanol

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is generated after a series of processes, and

finally

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used as fuel for vehicles. In the first stage, plants and trees are cultivated with enough sunlight and carbon dioxide, and

then

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harvested by automatic machines like harvesters. Afterwards, the collected plants are pre-processed into cellulose for the later real processing stage, where cellulose is transformed into sugars with some chemical techniques. Adding microbes to the extracted sugars will be the next step, and

ethanol

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will be produced

subsequently

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for cars, trucks, and aeroplanes. The vehicle taking

ethanol

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will emit carbon dioxide back to the environment and

thus

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form a feedback loop, providing the basic ingredient for plants to grow. The recycling loop is

then

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completed, which makes the

ethanol

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, a biofuel, more eco-friendly.