carbon trading
noun [uncountable]a system that gives countries and organizations the right to produce a particular amount of carbon dioxide and other gases that cause global warming, and allows them to sell this right 碳排放权交易；碳交易 a global carbon trading system 全球碳交易系统 Carbon trading has not been very effective so far in addressing global warming. 迄今为止，碳交易在应对全球变暖方面并不十分有效。