Being a Carbon Border Adjustment Mechanism, a carbon border adjustment mechanism, is a levy imposed on imports based on the greenhouse gas emissions connected with such items. When a country or trade bloc establishes a BCA, they have to calculate the related greenhouse gas emissions from manufacturing specific items they produce domestically or internally. It must also calculate the emissions linked to manufacturing comparable commodities in other countries. The difference decides the existence and method of a tariff between these values. Put another way, a product is subject to a tariff if its associated emissions are higher than those of a domestic product. The introduction of a BCA is primarily motivated by two factors: trade and climate. Since reducing GHG is a worldwide issue, progress in addressing climate change must transcend national boundaries.