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'''Carbon dioxide''' is exhaled when you breathe out.
'''Carbon dioxide''' in an odorless, invisible gas formed by the combustion of hydrocarbons. It is one of the human bodies major waste products, being excreted through exhalation.
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>.
Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>.
CO2 is one of the so-called "greenhouse" gases. Heat-trapping by CO2 has been observed on Earth and Venus. The extent of its role in the current increase in average global temperatures is a topic of active political discussion.
[[Category: Chemistry]]
[[Category: Chemistry]]