Embedded Emissions

Embedded emissions (also called embodied or consumption-based emissions) measure the greenhouse gases released across a product's full upstream supply chain — from raw material extraction through manufacturing and shipping — and assign them to the jurisdiction where the product is ultimately consumed. This contrasts with the territorial accounting method used under the UNFCCC, which attributes emissions to the country where they physically occur.

The distinction matters politically because high-income economies that have shifted heavy industry offshore can show falling domestic emissions while their consumption-based footprint remains flat or grows. Studies by the Global Carbon Project and researchers such as Glen Peters have repeatedly shown that the EU, UK, and Japan are net importers of embedded CO₂, while China, Russia, and several emerging economies are net exporters. This phenomenon is often described as carbon leakage when driven by policy asymmetries.

Embedded emissions are central to several live policy instruments:

• The EU Carbon Border Adjustment Mechanism (CBAM), which entered its transitional phase on 1 October 2023, requires importers of cement, iron and steel, aluminium, fertilisers, electricity, and hydrogen to report embedded emissions, with financial obligations beginning in 2026.
• The UK announced its own CBAM, scheduled to take effect in 2027.
• Proposals in the United States, including various iterations of a foreign pollution fee, also rely on calculating embedded emissions of imports.

Methodologically, embedded emissions can be calculated using process-based life-cycle assessment (bottom-up) or multi-regional input-output (MRIO) models such as EXIOBASE, GTAP, or Eora. Each approach involves trade-offs between product specificity and economy-wide coverage.

The concept is contested in trade diplomacy. Developing countries, particularly within the BASIC group (Brazil, South Africa, India, China), argue that border measures based on embedded emissions risk violating WTO non-discrimination principles and shift mitigation costs onto exporters without corresponding finance or technology transfer under the Paris Agreement's common but differentiated responsibilities principle.