noun
obligation to reduce carbon dioxide emissions
A formal, policy-oriented term used in environmental and legal contexts, referring to a binding duty to cut CO₂ output.
京都議定書は各国に二酸化炭素削減義務を課した。
The Kyoto Protocol imposed an obligation to reduce carbon dioxide emissions on each country.
Compound of 二酸化炭素 (carbon dioxide) + 削減 (reduction) + 義務 (obligation). A modern technical term with no historical derivation beyond its components.