The digram below shows ow a biofuel called ethanol is produced

The diagram illustrates how a biofuel called

ethanol

is produced. It outlines a cyclical

process

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

ethanol

and highlighting how the

carbon

dioxide

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

process

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

carbon

dioxide

.

This

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

ethanol

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

ethanol

generates

carbon

dioxide

, continuing the circular nature of the system.

Initially

, plants and trees are harvested after absorbing sunlight and

carbon

dioxide

, with machines playing a role in the collection

process

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

ethanol

production.

This

cellulose

then

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

ethanol

. Once

ethanol

is ready, it is used in various transport modes,

such

as cars, trucks, and

airplanes

Change the spelling

aeroplanes

show examples

. These vehicles release

carbon

dioxide

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

ethanol

production,

thus

sustaining the

process

.