Emissions intensity: reconcile boundaries before comparing
An emissions-intensity ratio can improve after selling a high-emitting business even when no retained facility becomes more efficient. The ratio’s numerator, activity denominator and organizational boundary must move together. Rebuild those elements before interpreting a lower reported number as evidence of operating decarbonization.
Identify the reporting framework and boundary
The GHG Protocol Corporate Standard describes organizational and operational boundaries for corporate emissions inventories. Use the company’s disclosed framework, consolidation approach and relevant reporting version. This worksheet applies its boundary concepts as research context; it does not certify an inventory or determine compliance with a jurisdiction’s disclosure law.
Record whether the inventory uses equity share or a stated control approach, which entities and activities it covers, and which emissions scopes enter the claimed ratio. Direct operational emissions, purchased-energy emissions and other value-chain emissions are different categories. A combined number should preserve the component coverage instead of implying that every category was measured equally.
A hypothetical disposal and efficiency bridge
Assume a fictional producer initially reports 100,000 tonnes of carbon-dioxide-equivalent emissions and 100,000 tonnes of compatible product output. Intensity is one tonne of emissions per product tonne. It then sells a facility contributing 40,000 emissions tonnes and 20,000 product tonnes, with no initial change in retained operations.
| Hypothetical comparison | Emissions tonnes | Product tonnes | Intensity |
|---|---|---|---|
| Original reported group | 100,000 | 100,000 | 1.00 |
| Retained business, before process change | 60,000 | 80,000 | 0.75 |
| Retained business, after a 2,000-tonne reduction | 58,000 | 80,000 | 0.725 |
The disposal alone improves reported intensity by 25%. The later process change reduces retained-business intensity by approximately 3.33%, from 0.75 to 0.725. Comparing 0.725 directly with one produces a 27.5% decline, which combines the boundary change and the operating change. Do not call the whole decline a process-efficiency achievement.
Keep absolute emissions beside intensity
The final reported emissions amount is 42% below the original group’s figure, but 40,000 tonnes left the reporting boundary through a sale. The world did not necessarily stop producing those emissions. The 2,000-tonne operating reduction requires its own evidence about the retained process and measurement method.
Conversely, intensity can improve while absolute emissions rise if output expands faster. Report both quantities on compatible boundaries. A revenue-based denominator can also change with prices or exchange rates; it should not be interpreted as physical efficiency without a separate activity check.
Inspect methodological changes
Review emission factors, estimation methods, purchased-energy treatment and changes in measured activity. A new factor can alter calculated emissions without changing physical consumption. Keep a methodological bridge separate from acquisitions, disposals and actual efficiency actions.
If the company reports a recalculated historical baseline, preserve the reported original series and the comparable recalculated series with clear labels. The objective is to understand the change, not to force an unreconciled historical number into the new population. Where the disclosure omits the effect, describe the missing bridge instead of inventing it.
The same principle applies to outsourcing: an activity can leave direct operational emissions while remaining in the value chain. Do not treat a change in scope classification as proof that the underlying process disappeared. Check the stated coverage of the broader inventory before making that claim.
Define a useful evidence card
Use fields for reporting entity, consolidation method, included facilities, emissions category, unit, activity denominator, factor version and comparison period. Review when a major asset transaction occurs, scope coverage changes or the denominator switches from physical output to revenue. The next action should target the changed element.
This is an inventory-comparability exercise, not a product life-cycle assessment, an offset-quality judgment or an assurance opinion. Missing supplier data and estimated factors can limit the precision of a group comparison. Keep those limits adjacent to the resulting percentage.
FAQ
Does a lower emissions intensity mean total emissions fell?
No. Growth can raise the absolute amount despite a lower ratio. Examine both numerator and denominator on the same boundary.
Should sold facilities remain in every comparison forever?
No. Use the relevant reporting approach and a clearly explained comparable series. The research task is to identify the transaction effect, not impose an arbitrary permanent boundary.