This is the 4211th most frequent Japanese word.
二酸化炭素
Carbon dioxide.
Used scientifically to describe its environmental property.
二酸化炭素は温室効果ガスの一つです。
Carbon dioxide is one of the greenhouse gases.
Used biologically to describe human breathing process.
呼吸するときに私たちは二酸化炭素を排出します。
When we breathe, we emit carbon dioxide.
Used ecologically to reference industrial emissions.