Carbon intensity vs. absolute emissions: What are the differences?

Carbon intensity and absolute emissions are the key indicators used to set decarbonization targets and track progress. While many companies focus on carbon intensity, they sometimes fail to explain this choice and its implications in their communications. Learn about the key differences between carbon intensity and absolute emissions, and why this distinction is crucial for corporate climate strategy.

Carbon intensity: measuring the carbon performance of operations

Carbon intensity is a ratio that expresses the amount of greenhouse gases (GHGs) emitted per unit of activity. It can be used to compare emissions:

• based on revenue generated (_kgCO2e/k€), particularly for service sector activities;
• per product (_{kgCO2e/product}) or per unit of work (_kgCO2e/unit), for production activities;
• in terms of full-time equivalents (_kgCO2e/FTE) for mixed or production activities.

{{note-1}}

‍

Carbon intensity KPIs enable companies to incorporate carbon into economic indicators and manage their operational performance more effectively. Unlike absolute emissions, they can be compared with similar indicators from competing companies. A carbon intensity target also has the advantage of compelling companies to continue their efforts, even when emissions decline due to a period of low activity.

Conversely, a decrease in carbon intensity can mask an increase in a company’s total emissions. And for good reason: the climate does not respond to ratios, but rather to the total quantities of GHGs emitted into the atmosphere. Furthermore, improvements in carbon performance sometimes tend to stimulate production, creating a rebound effect that offsets the absolute carbon savings in absolute terms.

Emissions in absolute terms: measuring the impact of one’s activities on the climate

Emissions in absolute terms (kg or_tCO2e) refer to the total emissions of a company, region, or country over a given period. It is these emissions that must be reduced globally to meet the climate change mitigation targets ofthe Paris Agreement. Nationally Determined Contributions (NDCs), as well as national roadmaps such as the National Low-Carbon Strategy, therefore set targets in absolute terms. The resulting low-carbon transition pathways are based on 1.5°C or 2°C reference scenarios and rely on multi-year, degressive carbon budgets.

Companies that wish to remain credible in their efforts to combat global warming must adopt the same approach. To set absolute reduction targets, organizations can, for example, use the SBTi’s “Absolute Contraction Approach” methodologies. It is also possible to rely on national documents, such as a sectoral transition plan or a decarbonization roadmap for a specific industry.

{{note-2}}

Why is the distinction between carbon intensity and absolute emissions so crucial?

For a long time, many companies have maintained a degree of ambiguity regarding the metrics they use to set decarbonization targets and track their progress. Today, however, evolving reporting frameworks, along with the expectations of consumers and investors, have made this distinction a major strategic issue.

Avoid greenwashing by adopting responsible communication practices

Many companies choose to focus on reducing their carbon intensity, sometimes at the expense of absolute targets. This tendency can be explained by the direct alignment of carbon intensity with an economic rationale: production optimization. However, this strategic decision is sometimes completely overlooked in organizational communications. It is thus quite common to see companies announcing 30% reductions in emissions without specifying that this refers to carbon intensity, not absolute emissions.

Today, this type of ambiguous statement is quickly associated with greenwashing and can have a lasting impact on a company’s credibility. That is why it is essential to adopt responsible communication practices, systematically specifying the climate indicator used. More broadly, any communication regarding changes in carbon intensity should always be accompanied by information on its impact on absolute emissions. The^10th principle of the Net Zero Initiative also recommends specifying the methodologies used, the scopes selected, and any important contextual factors.

Meeting the growing demands of international standards and investors

Today, regulators and voluntary international standards require a clear distinction between the two metrics and greater transparency regarding absolute emissions. Within the EU, the CSRD’s ESRS E1 standard requires reporting on both gross GHG emissions and carbon intensity based on net revenue. Emissions reduction targets must be disclosed in absolute terms. Disclosure of carbon intensity targets is optional.

The SBT Initiative, for its part, allows for the setting of targets in absolute terms (ACA methods) as well as in terms of carbon intensity. However, for Scopes 1 and 2, only companies operating in certain high-emission sectors may use the intensity-based approach, via the SDA method. Decarbonization targets for Scope 3 can be calculated in absolute emissions or using various carbon intensity-based approaches.

Regardless of the method used, emission reduction targets must be aligned:

• on a 1.5°C trajectory for short- and long-term goals under Scopes 1 and 2;
• on a trajectory well below 2 °C for short-term Scope 3 targets, and 1.5 °C for long-term Scope 3 targets.

The CDP questionnaire also allows companies to specify targets in terms of absolute emissions or carbon intensity. However, companies that report a carbon intensity target must specify the expected percentage change in absolute emissions associated with that target. As international frameworks tighten their requirements, investors are following suit. To maintain its credibility, a company must now be able to demonstrate a real, measurable reduction in absolute emissions that is aligned with baseline scenarios.

Decoupling emissions from growth: the real strategic challenge

Behind the distinction between carbon intensity and absolute emissions lies the strategic issue of decoupling emissions from growth. Indeed, carbon intensity is the preferred indicator for companies because it is easier to reduce than absolute emissions when revenue increases. A company that sets only intensity targets can thus be satisfied with a carbon footprint that grows more slowly than its revenue. This is referred to as relative decoupling between GHG emissions and revenue.

However, this level of decoupling is insufficient to address the climate emergency. Absolute decoupling, on the other hand, allows the two indicators to evolve independently of one another. To be consistent with the goals of the Paris Agreement, this decoupling—at the global level—must be absolute, but also rapid and sustainable. The possibility of achieving this ideal of “green growth” at the societal level is widely questioned, as detailed in this article by the consulting firm Carbone 4.

For businesses, the feasibility of achieving a sufficient level of decoupling to meet their emissions reduction targets without sacrificing growth depends on:

• its sector(s) of activity and the decarbonization measures available to it;
• based on its level of ambition and the resources allocated to its low-carbon transition.

In certain highly polluting sectors, particularly industrial ones, the physical limits of these activities act as a glass ceiling. In such cases, demand reduction can become an essential tool for achieving climate goals.

Conclusion

Although often pitted against one another, carbon intensity and absolute emissions both have a place in corporate transition plans. At the strategic level, absolute emissions (_tCO2e) are now the benchmark metric. They should be prioritized when setting targets, fulfilling regulatory reporting requirements, and communicating with investors and consumers.

But at the operational level, carbon intensity remains highly relevant. When broken down into business-specific KPIs for each process, product, or activity within the company, it enables decarbonization targets to be integrated into overall performance monitoring. Organizations therefore have every reason to implement a hybrid dashboard featuring both operational indicators (_kgCO2e/unitproduced) and business indicators (_kgCO2e/k€).

This allows them to track their progress in reducing their carbon footprint while measuring changes in the decoupling between their emissions and their revenue. AsTennaxia’s 2025 study shows, the preferred frequency for internal reporting on ESG data is quarterly. However, certain sustainability metrics may benefit from monthly monitoring.

‍

Sources :

• “Reducing greenhouse gas (GHG) emissions or the carbon intensity of one’s operations?”, Humanitarian Environment Network.‍
• Corporate Net-Zero Standard criteria, Science Based Targets initiative.‍
• Getting Started Guide for Developing Science-Based Targets, Science Based Targets initiative.‍
• “Decoupling : A Concept at the Heart of Debates on the Ecological Transition,” September 29, 2022, Le Climatoscope.‍
• “Decoupling and Green Growth,” September 2021, Carbone 4
• ‍Full Corporate Questionnaire, Module 7, CDP.‍
• Definition of the objectives of the Bilan Carbone® method, Association for the Low-Carbon Transition.