English version

emissions trading

From Longman Dictionary of Contemporary Englishemissions tradingeˈmissions ˌtrading noun [uncountable]  the practice of buying or selling emission creditsFrom Longman Business Dictionaryemissions tradingeˈmissions ˌtrading FINANCEthe activity of buying and selling emission credits (=a tax credit which a company that does not send harmful gases or other substances into the air can sell to a company that does) or emission units (=an official right allowing a company to send a specific amount of harmful gases or other substances into the air) trading
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