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
