Carbon trading refers to trading quotas for carbon emissions, and only with quotas can carbon dioxide be emitted. Moreover, some companies may not have quotas or have insufficient quotas, so they can buy quotas in the carbon emission trading system, and some companies with good carbon emissions can trade quotas, so they can make money. The purpose of carbon trading is to control the total amount of carbon emissions through economic means, so as to achieve the effect of energy saving and emission reduction.