The diagram below shows how a biofuel called ethanol is produced.

The map illustrates the cyclical process involved in producing

ethanol

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.

Overall

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, the biofuel production cycle consists of four main stages, starting with harvesting plant materials and ending with its use as a transportation fuel. At the outset of the process, plants and trees undergo growth, fueled by sunlight and absorbing carbon dioxide from the atmosphere. Once mature, they are mechanically harvested and fed into a pre-processing machine.

This

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machine breaks down the plant materials into smaller components, primarily cellulose.

Following

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this

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, the extracted cellulose is converted into sugars through chemical processing. These sugars are

subsequently

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fermented with the addition of microbes, resulting in the production of

ethanol

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. In

this

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stage,

ethanol

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is ready to use as fuel for various modes of transport, including cars, trucks, and planes. During

this

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utilisation,

ethanol

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undergoes combustion, releasing carbon dioxide back to the atmosphere.

This

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pollutant is

then

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absorbed again by plants and trees, thereby restarting the cycle.