二氧化碳 èryǎnghuàtàn carbon dioxide CO2
How to remember 二氧化碳: 二 two + 氧 oxygen + 化 change + 碳 carbon = carbon dioxide CO2.
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How it is used
- Carbon dioxide (CO₂) - 二氧化碳排放 (èryǎnghuàtàn páifàng) CO₂ emissions.
- Chemically transparent: 二 (two) + 氧 (oxygen) + 化 + 碳 (carbon) = 'two-oxygen-ized carbon.'
- Central to climate talk: 减少二氧化碳 to cut CO₂; contrast 一氧化碳 (carbon monoxide).
- 排放二氧化碳 = to emit carbon dioxide.