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[[Image:CO2phase.jpg|thumb|right|300px|[[Phase diagram]] for CO<sub>2</sub>]]
[[Image:CO2phase.jpg|thumb|right|300px|[[Phase diagram]] for CO<sub>2</sub>]]
'''Carbon dioxide''' (CO<sub>2</sub>) is an odorless, colorless [[gas]] formed by the [[oxidation]] of [[hydrocarbon]]s, both naturally, in animals, and artificially, as fuel<ref>If not enough oxygen is present, [[carbon monoxide]] will also be produced, in a process called [[incomplete combustion]].</ref>. It is one of the [[human]] body's major waste products, being excreted through exhalation.
'''Carbon dioxide''' (CO<sub>2</sub>) is an odorless, colorless [[gas]] formed by the [[oxidation]] of [[hydrocarbon]]s, both naturally, in animals, and artificially, as fuel<ref>If not enough oxygen is present, [[carbon monoxide]] will also be produced, in a process called [[incomplete combustion]].</ref>. It is one of the [[human]] body's major waste products, being excreted through exhalation (breathing).
It is used by [[plants]] in the process of [[photosynthesis]] to create complex carbohydrates ([[cellulose]] and [[sugar]]s), using water and the [[energy]] from [[sunlight]]. The waste product in this process is [[oxygen]].
It is used by [[plants]] in the process of [[photosynthesis]] to create complex carbohydrates ([[cellulose]] and [[sugar]]s), using water and the [[energy]] from [[sunlight]]. The waste product in this process is [[oxygen]].