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Where does carbon dioxide come from?

April 26, 2017carbon dioxide

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Where does carbon dioxide come from?

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A. When animals breathe (respire), they take in oxygen and expel carbon dioxide. Fish and other aquatic animals also respire and discharge carbon dioxide into the water where it can be taken up by the algae cells.

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Carbon dioxide comes from a mixture of natural and man-made (anthropogenic) sources. The primary source of man-made CO2 emissions comes from the burning of fossil fuels (oil, natural gas, and coal) for energy production in the transportation, industrial, commercial, and residential sectors.