CO2
174
2.6
- noun
- /siː oʊ tuː/
- Specialized
:
dióxido de carbono
- ...to curb the CO2 emissions from electricity production.
- CO2 emissions
- carbon dioxide (CO2)
- atmospheric CO2
Examples
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It's clear there's CO2 aplenty.
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A human signal attributed to vehicle exhaust was apparent in higher CO2 output on weekdays compared with weekends and holidays.
Academic text (2008) -
And look at the CO2 levels.
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Yeah, Jim, could you check your CO2 gauge for us?
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Trees absorb CO2, they're good for the environment.
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The World Bank's report is explicit about uncertainty and areas for further research, especially about CO2 fertilization.
Academic text (2011) -
Concern has been expressed about the greenhouse effect of carbon dioxide (CO2) on the earth's atmosphere.
Academic text (1999) -
Runoff provides nutrients to feed plankton and removes CO2 from the air through the weathering process.
Academic text (1991) -
The Pearl's anti-fire measures employ a one-of-a-kind self-sealing ventilation system and a robust sprinkler and CO2 array which can put out a fire in a fraction of the time.
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Plants absorb CO2 during photosynthesis to produce oxygen.
Synonyms
95
2.3
A colorless gas without smell that people and cars make and plants use to make oxygen
A colorless, odorless gas called carbon dioxide that plants use to make food
Surface Forms
Morphology
CO2 = C + O + 2
CO2 is a chemical formula (element symbols plus a numeral), not a combination of productive English morphemes, so knowing the parts does not let a typical learner derive 'carbon dioxide'.
Etymology
CO2 is short for carbon dioxide — the name breaks into carbon, di-, and oxide, where di- means 'two' and oxide shows it has oxygen. So CO2 is one carbon joined to two oxygen atoms, which helps you remember it is the gas made when things burn or when animals breathe out and that plants absorb it.