Section 01 — Context
Four pillars of ISO 14068-1:2023
Before 2023, "carbon neutral" was a marketing term with no agreed meaning. ISO 14068-1 closes that gap with four mandatory pillars. Conformance to all four is the bar a claim must clear under the EU Green Claims Directive, the UK CMA Green Claims Code, and the FTC Green Guides revisions.
Pillar 01 · §4.4 + §5.2
Mitigation hierarchy
Reduce in-boundary first. Then enhance in-boundary removals. Only THEN offset. Skipping rungs is non-conformant and the extension's hierarchyStep tag makes the order auditable.
Pillar 02 · §8 + Annex C
Quantification by reference
Does not invent a new accounting method. Defers to ISO 14064-1 for organizations and ISO 14067 for products, with GHG Protocol consistency carve-outs. COMET PCFs are already compatible.
Pillar 03 · §11
Credit gatekeeping
Five mandatory credit criteria — Real · Additional · Measurable · Permanent · Certified — and nine programme-level requirements covering registries, leakage, double counting, and Article 6.4 corresponding adjustments.
Pillar 04 · §12
Mandatory public report
A 24-element carbon-neutrality report — including the verification opinion — must be published for every reporting period. The extension types it as comet-cn:CarbonNeutralityReport, sub-class of comet-ver:DisclosureRecord.
Section 02 — At a glance
What the extension contributes
Most of ISO 14068's vocabulary already lives inside COMET — the work is bridging via owl:equivalentClass and adding the new structural concepts (Plan, Pathway, Claim, Report) that ISO 14068 demands.
Section 03 — Merge map
Where COMET already covers ISO 14068
Eighteen ISO 14068 terms map directly onto existing COMET classes. The extension declares these alignments via owl:equivalentClass so reasoners flow data between vocabularies without lossy conversion. No new class is created here — only the bridge.
| ISO § |
ISO 14068 term |
Existing COMET class |
Note |
| 3.2.4 | carbon footprint | comet-pcf:PCFResult | Identical for products via ISO 14067; orgs reuse class with organizational boundary |
| 3.2.5 | direct GHG emission | comet-pcf:Scope1Emission | Direct = GHG Protocol Scope 1 |
| 3.2.6 | indirect GHG emission | comet-pcf:IndirectGHGEmission | Covers Scope 2 + Scope 3 — disambiguate downstream |
| 3.2.7 | GHG removal | comet-pcf:GHGRemoval | Reforestation, soil sequestration, BECCS, DAC + storage |
| 3.2.9 | GHG source | comet-sc:GHGSource | — |
| 3.2.10 | GHG sink | comet-sc:GHGSink | Natural or anthropogenic |
| 3.2.11 | global warming potential | comet-pcf:GlobalWarmingPotential | IPCC AR-aligned values |
| 3.2.12 | CO₂ equivalent | comet-pcf:CO2Equivalent | — |
| 3.2.16 | boundary <organization> | comet:OrganizationalBoundary | Per ISO 14064-1 |
| 3.2.17 | boundary <product> | comet-pcf:SystemBoundary | Per ISO 14067 |
| 3.3.2 | carbon credit | comet-eac:CarbonCredit | ISO 14068 criteria layered on as comet-cn:CreditCriterion |
| 3.3.4 | carbon crediting programme | comet-eac:CreditingProgramme | Verra, Gold Standard, ART TREES, CAR, etc. |
| 3.3.5 | public registry | comet-eac:PublicRegistry | — |
| 3.4.3 | organization | comet:Organization | — |
| 3.4.4 | product | comet:Product | — |
| 3.4.5 | stakeholder | comet:Stakeholder | — |
| 3.4.6 | top management | comet:TopManagement | Required signatory of the commitment |
| 3.4.7 | value chain | comet-sc:ValueChain | Includes upstream + downstream + end-of-life |
Section 04 — Expansion
New classes ISO 14068 forces COMET to add
Twenty-four concepts in ISO 14068 had no representation in COMET v0.2. They are introduced under the new comet-cn: namespace and organized by the COMET layer they extend.
| Layer |
New class |
ISO § |
Why it is needed |
| L1 Core | comet-cn:Subject | 3.4.2 | The unit being claimed neutral. owl:unionOf (Organization Product) |
| L1 Core | comet-cn:Entity | 3.4.1 | The body MAKING the claim — distinct from Subject (parent claims for child product) |
| L1 Core | comet-cn:FinancialInstitution | 3.4.3.1 | Triggers the financed-emissions accounting requirement (Annex B.3) |
| L4 PCF | comet-cn:Baseline | 3.2.13 | Quantified base-period footprint, reductions are measured against |
| L4 PCF | comet-cn:BasePeriod | 3.2.14 | Historical comparison period |
| L4 PCF | comet-cn:ReportingPeriod | 3.1.6 | Period for which the claim is made — typically annual |
| L4 PCF | comet-cn:UnabatedGHGEmission | 3.1.4 | Emission left after in-boundary reductions |
| L4 PCF | comet-cn:ResidualGHGEmission | 3.1.5 | What remains after ALL technically + economically feasible reductions. Anchors long-term pathway target |
| L4 PCF | comet-cn:GHGEmissionReduction | 3.2.3 | First-class reduction artefact, baseline-relative |
| L4 PCF | comet-cn:GHGRemovalEnhancement | 3.2.8 | Distinct from a one-off removal; reversals re-class as emissions |
| L4–L7 | comet-cn:CarbonNeutralityCommitment | 6 | Required precondition — top-management commitment artefact |
| L4–L7 | comet-cn:CarbonNeutralityPathway | 5.3 | Trajectory with short, long, residual-only targets — IPCC/IEA/SBTi-aligned |
| L4–L7 | comet-cn:CarbonNeutralityManagementPlan | 9 | Composed of pathway + baseline + targets + safeguards (13 mandatory elements) |
| L4–L7 | comet-cn:CarbonNeutralityClaim | 3.1.3 | The public declaration |
| L4–L7 | comet-cn:CarbonNeutralityReport | 12 | The 24-element public report — sub-class of comet-ver:DisclosureRecord |
| L4–L7 | comet-cn:HierarchyAction | 4.4 + 5.2 | Enum: reduce / enhance / offset — mandatory tag on every plan action |
| L5 EAC | comet-cn:CreditCriterion | 11.2 | Real · Additional · Measurable · Permanent · Certified |
| L5 EAC | comet-cn:CreditingProgrammeCriterion | 11.3 | Nine programme-level criteria |
| L5 EAC | comet-cn:CreditType | 3.3.2 N2 | Avoidance / Reduction / Removal — drives whether usable after residual |
| L5 EAC | comet-cn:OffsettingEvent | 3.3.1 + 11 | Sub-class of comet-eac:RetirementEvent with vintage + 12-month constraints |
| L5 EAC | comet-cn:CorrespondingAdjustment | 11.1 N | Article 6.4 disclosure (§12 t) |
| L6 Ver | comet-cn:RemovalReversal | 10.2 | Re-class as emission in the reporting period of reversal |
| L6 Ver | comet-cn:VerificationOpinion | 12 w | Bridges to ISO 14064-3 |
| L7 / B.3 | comet-cn:FinancedEmissionsAccount | Annex B.3 | Financial-institution-specific component aligned to PCAF methodology |
Section 05 — Stack view
Where the new classes live
The extension threads through five of COMET's seven layers. The CarbonNeutralityManagementPlan is intentionally cross-cutting — it composes objects from L4 through L7, mirroring how the standard itself is structured.
L7
Market Signal — pricing residual-only credits
Hierarchy-aware premia; AvoidanceCredit ≠ RemovalCredit ≠ ReductionCredit. The L7 market can finally price the difference because credits carry their type, vintage, and corresponding-adjustment status.
CreditType
RemovalCredit (residual-only)
L6
Verification & Assurance
Independent verification opinion is mandatory in the report (§12 w). Reversals must be re-classed as emissions in the period of reversal (§10.2).
VerificationOpinion
RemovalReversal
CorrespondingAdjustment
L5
Environmental Attribute Certificate
Five mandatory credit criteria + nine programme-level criteria. Vintage end ≤5y before claim period; retirement ≤12 months after period end. SHACL constraints enforce both.
CreditCriterion
CreditingProgrammeCriterion
OffsettingEvent
L4
Product / Organization Carbon Footprint
Baseline · BasePeriod · ReportingPeriod give the footprint time-bounded comparison semantics. Unabated and Residual emissions are typed sub-classes of GHG emission.
Baseline
UnabatedGHGEmission
ResidualGHGEmission
GHGEmissionReduction
GHGRemovalEnhancement
L1
Core Identity
Subject (Organization ∪ Product) and Entity (the body making the claim) become first-class — distinct because a parent company can claim neutrality for one of its products, not for itself.
Subject
Entity
FinancialInstitution
Cross-cutting (L4 → L7): CarbonNeutralityCommitment · CarbonNeutralityPathway · CarbonNeutralityManagementPlan · CarbonNeutralityClaim · CarbonNeutralityReport · HierarchyAction.
Section 06 — Stakeholder benefits
What ISO 14068 in COMET means to each role
The same machine-readable carbon-neutrality artefacts serve different audiences differently. The benefit profile below is the basis for stakeholder conversations once an organization adopts the extension.
Industrial buyers & product owners
Defends premium pricing under regulatory pressure
- Every premium product carries a structured
CarbonNeutralityReport referenced from the PCF — auditors, customers and regulators see the full chain in one query.
- Hierarchy discipline is enforced by tagging — finance can refuse plans that purchase offsets before exhausting reductions.
- Baseline, base period, reporting period become typed versioned artefacts instead of cells in one person's spreadsheet.
Financial institutions
Annex B.3 + PCAF in one payload
- Direct integration of financed emissions via
FinancedEmissionsAccount — same JSON-LD supports ISO 14068 and a PCAF disclosure.
- Prudential value: ECB / PRA / FSB increasingly require evidence that net-zero pledges have hierarchy and pathway substance.
- Verified residual-only credits priced via
RemovalCredit carry different risk than AvoidanceCredit — L7 Market layer can price the difference.
Carbon verifiers (BV / SGS / DNV / TÜV)
Verification scope becomes machine-readable
- Ingest the
CarbonNeutralityManagementPlan directly; check each clause against ISO 14068 mandatory elements.
RemovalReversal, CorrespondingAdjustment, OffsettingEvent with vintage + retirement dates are first-class objects — re-issuing reasonable assurance year over year becomes diff-on-graph.VerificationOpinion is a sub-class of comet-ver:AuditClaim, so existing verification workflows extend cleanly.
Regulators (DG ENV · CMA · FTC)
Greenwash enforcement asset
- EU Green Claims Directive substantiation: COMET + ISO 14068 produces a canonical JSON-LD per claim — easier to subpoena, easier to compare across firms, easier to prosecute when missing.
- Hierarchy compliance is queryable: a SPARQL query answers "did this entity offset before exhausting in-boundary reductions?" without reading any prose.
- Cross-border consistency reduces forum shopping between Brussels, London and Washington.
LCA practitioners
PCF outputs become claim-ready
- Practitioners already produce ISO 14067 PCFs — the extension wraps the existing result in
Baseline, BasePeriod, ReportingPeriod so no parallel methodology is needed.
- Sectoral pathway alignment encoded directly:
CarbonNeutralityPathway carries the science-based pathway reference (IPCC / IEA / SBTi / ACT).
- SimaPro, openLCA, GaBi, ecoinvent users gain a clean export target instead of bespoke claim-spreadsheets.
Carbon-market platforms & registries
Programme-level conformance becomes declarative
CreditingProgrammeCriterion enumerates the nine §11.3 requirements. Verra, Gold Standard, ART TREES, CAR can publish a one-time owl:sameAs mapping to declare conformance and inherit access to ISO 14068 buyers.- Vintage and retirement enforcement: datatype properties make timing rules computable — a registry can refuse a retirement that violates them.
- Differentiated pricing: removal-based residual-only credits carry visible premium signals in the L7 layer.
Investors & analysts
Cuts through claim noise
- Distinguishes a claim with hierarchy + pathway + verification from one without, in machine-readable form. Ratings can be derived rather than asserted.
- Pathway-aware exposure: portfolio models can integrate
targetYearResidualOnly directly — exclude or weight names whose pathway slips beyond 2050 without narrative interpretation.
- Transition-debt issuance can reference structured pathway targets in the bond covenant instead of prose milestones.
Top management of the entity
Accountability with controlled risk
- ISO 14068 §4.10 puts accountability for the claim with top management. The extension provides the mechanism to evidence that accountability — not just assert it.
- Continual-improvement obligation (§5.2): the SPARQL query "did the use of offsetting decrease vs prior reporting period?" is a one-line audit.
- Litigation defence: a structured, verified record of hierarchy compliance reduces exposure to misleading-conduct actions.
Section 07 — Compliance edge
What ISO 14068 forbids — and how the extension catches it
The standard's value lies as much in what it rules out as in what it requires. Each forbidden practice below maps to a SHACL constraint or SPARQL-detectable pattern in the extension.
| Forbidden practice |
How the extension catches it |
| Offsetting before reducing in-boundary | Every action carries comet-cn:hierarchyStep; SPARQL surfaces plans where step 3 precedes steps 1–2 |
| Using credits whose vintage ended >5 y before claim period | vintageEndYear ≥ reportingPeriodStart − 5y is a SHACL constraint |
| Retiring credits more than 12 months after period end | retirementDate ≤ reportingPeriodEnd + 12 months is a SHACL constraint |
| Double counting between entity and host country (Article 6) | correspondingAdjustmentApplied boolean must be present and disclosed |
| Forward-flow credits (ex-ante) used for a current claim | isExPostCredit = true is required |
| Quietly dropping a reversed removal | RemovalReversal must be re-classed as emission in the period of reversal |
| Using only avoidance credits to offset residual emissions | When ResidualGHGEmission > 0, accompanying credits must be RemovalCredit (per §11.1) |
| Claiming neutrality with no top-management commitment artefact | CarbonNeutralityClaim requires a linked CarbonNeutralityCommitment (cardinality ≥ 1) |
| Publishing without a verification opinion | CarbonNeutralityReport requires a linked VerificationOpinion (§12 w) |
Section 08 — Adoption
Implementation checklist for adopters
Step-by-step path from a working COMET dataset to a published ISO 14068-conformant claim. Each step produces a concrete object in the graph; each object is verifiable independently.
- Stand up Entity and Subject. Create
comet-cn:Entity and the comet-cn:Subject it claims for; bind a Boundary per ISO 14064-1 (orgs) or ISO 14067 (products).
- Set time semantics. Define
BasePeriod, compute Baseline (reuse comet-pcf:PCFResult), set ReportingPeriod.
- Build the pathway. Construct
CarbonNeutralityPathway with targetYearResidualOnly and short/long-term targets aligned to a science-based pathway (IPCC / IEA / SBTi / ACT).
- Compose the management plan. Compose
CarbonNeutralityManagementPlan covering all 13 mandatory elements of §9.1; tag every action with comet-cn:hierarchyStep.
- Execute hierarchy in order. Reduce, then enhance removals; quantify each as
GHGEmissionReduction / GHGRemovalEnhancement against the Baseline.
- Determine residual. Compute remaining
ResidualGHGEmission / UnabatedGHGEmission; size the offsetting volume.
- Source compliant credits. Assert each meets the five
CreditCriterion. Encode vintageEndYear, correspondingAdjustmentApplied, isExPostCredit. Retire as OffsettingEvent ≤12 months after reporting-period end.
- Commission verification. Obtain
VerificationOpinion (ISO 14064-3 methodology). Publish CarbonNeutralityReport covering all 24 elements of §12.
- Re-evaluate annually. Re-run the plan against new data; reclassify any
RemovalReversal as emission in the reporting period of reversal.