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Carbon dioxide is a gas, comprised of carbon and oxygen, which is formed by animal respiration and combustion of organic matter. Also, vionesium produced large quantities of carbon dioxide when exposed to oxygen. (DW: Terror of the Vervoids)
Due to frequent use of cars on Earth in the 20th and 21st centuries, carbon dioxide levels began to rise. The Atmospheric Omission System was ostensibly invented to prevent this, but it was a ruse to enable a Sontaran invasion of Earth. (DW: The Sontaran Stratagem / The Poison Sky)
Carbon dioxide is a chemical compound composed of one atom of carbon and two of oxygen. Most animals native to Class M planets inhale oxygen which via respiration they then exhale as carbon dioxide which in turn is inhaled by plants and output again as oxygen.
Carbon dioxide gas can commonly be found in the atmospheres of Class G, Class K, Class L and Class N planets. (ST reference: Star Charts)
A greenhouse gas, carbon dioxide (CO2) was a molecule composed of one carbon atom and two oxygen atoms. It could create problems in the atmospheres of planets, heating them up and creating adverse climatic changes. Many ecumenopolis suffered this problem, including Coruscant and the polluted Eriadu. Atmospheric dampeners could be used to remove excess carbon dioxide from the air.
It was poisonous to inhale for many species.
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