The digram below shows ow a biofuel called ethanol is produced

The diagram illustrates how a biofuel called

ethanol

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is produced. It outlines a cyclical

process

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involving natural and industrial steps, showing the transformation from plant-based materials to

ethanol

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and highlighting how the

carbon

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dioxide

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emitted by transport completes the cycle. From a broad perspective, the production

process

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begins with the harvesting of plants and trees, which absorb energy from sunlight and

carbon

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dioxide

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.

This

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leads to a sequence of chemical and biological steps that convert plant materials into

ethanol

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. The final product is distributed for transportation purposes, where the combustion of

ethanol

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generates

carbon

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dioxide

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, continuing the circular nature of the system.

Initially

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, plants and trees are harvested after absorbing sunlight and

carbon

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dioxide

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, with machines playing a role in the collection

process

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. The gathered material undergoes pre-processing to break it down into cellulose, which serves as a key component for

ethanol

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production.

This

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cellulose

then

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proceeds to chemical processing, where sugars are extracted. In the subsequent stages, microbes are added to the sugars, initiating fermentation to produce

ethanol

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. Once

ethanol

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is ready, it is used in various transport modes,

such

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as cars, trucks, and

airplanes

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aeroplanes

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. These vehicles release

carbon

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dioxide

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into the atmosphere, which re-enters the cycle by feeding the plants used in future

ethanol

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production,

thus

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sustaining the

process

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.