Carbon Intensity
Carbon intensity is a ratio that expresses greenhouse gas emissions relative to a business metric — such as emissions per unit of revenue, per product manufactured, per square meter of floor area, or per employee. It complements absolute emissions by showing efficiency improvements even as an organization grows.
While absolute emission reductions are the ultimate goal of climate action, carbon intensity metrics provide essential context for growing organizations. A company that doubles revenue while only increasing emissions by 20% has improved its carbon intensity by 40% — meaningful progress even though absolute emissions rose.
Common intensity metrics include: tCO₂e per million dollars of revenue (economic intensity), tCO₂e per tonne of product (physical intensity), tCO₂e per square meter (real estate intensity), tCO₂e per FTE employee, and kgCO₂e per kWh (grid intensity).
SBTi allows either absolute or intensity-based near-term targets, but its net-zero standard requires absolute reductions. CSRD ESRS E1 requires reporting both absolute emissions and intensity ratios. CDP asks for both types.
Choosing the right intensity denominator matters. Revenue-based metrics are easy to calculate but affected by price changes and currency fluctuations. Physical metrics (per tonne, per unit) are more meaningful for manufacturing but require consistent product definitions. Organizations often track multiple intensity metrics for different audiences — investors prefer revenue-based, operations teams prefer physical metrics.
Frequently asked questions
What is carbon intensity? +
What is the difference between absolute emissions and carbon intensity? +
Related terms
Carbon Accounting
Carbon accounting is the systematic process of measuring, recording, and reporting the greenhouse gas (GHG) emissions produced by an organization, product, or activity. It follows standardized methodologies — most commonly the GHG Protocol — to quantify emissions across Scope 1 (direct), Scope 2 (purchased energy), and Scope 3 (value chain) categories, producing an auditable inventory that underpins disclosure, reduction planning, and regulatory compliance.
tCO₂e (Tonnes of CO₂ Equivalent)
tCO₂e — tonnes of carbon dioxide equivalent — is the standard unit for expressing greenhouse gas emissions. It normalizes different greenhouse gases (methane, nitrous oxide, HFCs, etc.) to their equivalent warming impact relative to CO₂ using global warming potentials (GWPs), allowing them to be summed into a single comparable metric.
SBTi (Science Based Targets initiative)
The Science Based Targets initiative (SBTi) is a partnership between CDP, WRI, the UN Global Compact, and WWF that defines and validates corporate greenhouse gas reduction targets consistent with the Paris Agreement goal of limiting warming to 1.5°C above pre-industrial levels.
CSRD (Corporate Sustainability Reporting Directive)
The Corporate Sustainability Reporting Directive (CSRD) is the European Union's mandatory sustainability reporting law. It requires companies operating in the EU above certain thresholds to disclose environmental, social, and governance (ESG) information according to the European Sustainability Reporting Standards (ESRS), with third-party assurance.
Decarbonization
Decarbonization is the process of reducing greenhouse gas emissions across an organization's operations and value chain through energy efficiency improvements, fuel switching, renewable energy procurement, process changes, supply chain engagement, and technology adoption. It is the operational work that turns reduction targets into real emission cuts.