The CBAM 80/20 Data Mandate: Tracing precursor emissions in aluminium supply chains

In the foundational article of this AL Circle exclusive series, we showcased the financial reality awaiting downstream aluminium exporters in 2028. We established that the European Union Carbon Border Adjustment Mechanism (CBAM) will permanently erase the comfortable illusion of the corporate veil. We concluded with the remark: survival requires tracking and verifying the embedded carbon inherited from every upstream supplier.

Today, we confront the exact mechanics of that legacy.

During the initial CBAM rollout, regulatory attention focused heavily on the importation of basic upstream commodities. The compliance model for simple goods, like unwrought aluminium, was administratively demanding but fundamentally linear. Importers calculated the emissions of a distinct metallurgical process and surrendered the corresponding carbon certificates.