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CO2, a compound consisting of one carbon and two oxygen. It is a reactant in photosynthesis and necessary for plant life. Abundant in the atmosphere due to anthropogenic and natural activities. It is a greenhouse gas.

[Journal of Geophysical Research;v96; 7301-7312;1991] [Environmental Science and Technology;v28; 1565-1576;1994]

Source: Atmospheric Chemistry Glossary