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All of these insects, animals, and humans are breathing taking in oxygen and releases carbon dioxide.
Factories also produce carbon dioxide as a waste product when burning fuel; so all the smoke being released in the air is CO2.
One of the biggest transportation in today's world are cars. Cars need gas for them to run and all that gas being used it creates CO2.
Trees then later absorb the carbon dioxide for growth to produce more.
Plants then release oxygen back to people and animals to breathe.
The whole cycle restarts when the oxygen is sent back to humans and animals.
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