The diagram below shows how ethanol is produced

The diagram shows the stages needed to manufacture biofuel known as

ethanol

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.

Overall

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, the process comprises four main stages, in which mature trees are processed as

ethanol

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, going through harvesting, pre-processing, and processing, and

finally

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the intervention of microbes.   Plants and trees, in the very initial stage, need to acquire sunlight and carbon dioxide from nature to derive energy so they can reach full growth. Once they are fully grown, harvesting takes place with the help of heavy machinery, which in turn is followed by pre-processing to extract cellulose. The cellulose

then

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undergoes some processing to be converted into sugars. Via microorganisms, the sugars are processed into

ethanol

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in the

ethanol

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fermentation stage. Generated

ethanol

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is

then

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distributed to various vehicles, including trucks, cars, and planes to produce fuel. Carbon dioxide generated through these transports is emitted into the atmosphere, which can be

further

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absorbed by trees during photosynthesis.