Policymakers in various regions, including the United States and Europe, have observed that carbon emissions from producers vary globally. As a result, regulations are being developed based on this discrepancy. Examples of such regulations include import tariffs linked to the carbon footprint of products, like the E.U.’s Carbon Border Adjustment Mechanism or the U.S.’s Foreign Pollution Fee Act. Additionally, some regions are implementing mandatory carbon labeling for specific high-emission products, as seen in the E.U.’s Battery Regulation. Furthermore, there are public procurement guidelines that prioritize low-emission products.