Changes

'''Carbon dioxide''' (CO₂) 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>  

'''Carbon dioxide''' (CO₂) 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 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]].  ''Carbon dioxide is not a pollutant, but a pervasive byproduct of life''.

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]].  ''Carbon dioxide is not a pollutant, but a pervasive byproduct of life''. CO₂ should be called an "emission", not a "pollutant", in debates about [[global warming]].

It is one of the [[human]] body's major waste products, being excreted through exhalation (breathing).   

It is one of the [[human]] body's major waste products, being excreted through exhalation (breathing).