Consumption-Based Carbon Accounting

Consumption-based carbon accounting attributes emissions to the final consumption of goods and services, including emissions released elsewhere to produce them. Production-based emissions accounting attributes emissions to the territory where they occur. The difference is therefore whether responsibility follows the location of production or the demand that production satisfies.

Where emissions are assigned

The two approaches examine the same production-consumption relationship from different ends. Their results differ because goods and services cross borders while the emissions associated with producing them occur along their supply chains.

• Production-based accounting counts emissions from activities within a country's territory, including production for export, but excludes emissions released abroad in producing its imports.
• Consumption-based accounting includes domestic and foreign emissions associated with a country's final demand, while excluding domestic emissions associated with exports.
• Final demand includes household consumption, government consumption and capital investment; consumption-based accounting is therefore broader than an individual's household carbon footprint.
• For example, emissions from making steel in one country for final use in another remain with the producer under territorial accounting but are attributed to the consuming country under consumption-based accounting.

How the consumption footprint is calculated

Using consistent emissions coverage and accounting boundaries, the basic relationship is: consumption-based emissions = production-based emissions + emissions embodied in imports - emissions embodied in exports.

• Embodied emissions are emissions released along the production supply chain, not necessarily carbon physically contained in the traded product.
• Calculations commonly combine input-output tables, international trade data and sectoral emissions data to trace emissions through interconnected industries.
• A net importer of embodied emissions has a consumption footprint larger than its production-based total; a net exporter has the reverse.

Why the distinction matters for climate policy

Territorial inventories provide the basis for national emissions reporting under the international climate framework. Consumption-based estimates complement them by revealing the emissions implications of demand and trade.

• A fall in territorial emissions does not necessarily imply an equivalent fall in the consumption footprint if domestic production is replaced by emissions-intensive imports.
• Consumption-based accounting can inform demand-side mitigation through material efficiency, longer product lifetimes and lower-emission consumption choices.
• It supports debates about producer and consumer responsibility, but does not by itself establish how mitigation costs should be shared.
• Its estimates depend on trade and supply-chain data and modelling assumptions, making detailed attribution more uncertain than the basic accounting identity suggests.