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The car-carrier sector has moved another step toward a common system for measuring the emissions generated when vehicles are transported by sea. On August 19, the Global Ro-Ro Community established the GRC Council, giving the industry's emissions methodology a formal governance structure responsible for reviewing calculation rules, data handling and future methodology changes. Companies participating in the initiative represent approximately 80% of global car-carrier transport capacity, while ClassNK is providing independent verification of emissions data. The development builds on the sector's common deep-sea RoRo calculation methodology, its first industry-average emissions factors and a data platform designed to produce comparable carrier and trade-lane information for automakers and other cargo owners calculating Scope 3 emissions. The methodology is aligned with ISO 14083 and the GLEC Framework and relies on primary operating data rather than leaving each shipping line or vehicle manufacturer to develop a separate calculation method
Operator Impact Snapshot
Carrier numbers become easier to compare
The common methodology reduces differences created when individual operators calculate transport emissions using different allocation, fuel or voyage assumptions.
Ocean transport moves deeper into Scope 3 reporting
Vehicle manufacturers can use standardized carrier and trade-lane factors instead of relying only on broad generic shipping estimates.
Primary vessel data gains independent checks
Third-party verification gives cargo owners a more defensible emissions figure when comparing shipping providers or preparing corporate carbon inventories.
Carbon intensity can become another carrier metric
Price, schedule and damage performance remain central to car-carrier contracts, but standardized emissions data creates another measurable difference between competing fleets.
The Framework Moving From Estimate to Verified Data
The industry's carbon-data project has developed in stages, from a common calculation method to benchmarks, vessel data, trade-lane comparisons and now formal governance.
| Data Layer | Current Structure | Data Basis | Primary User | Status |
|---|---|---|---|---|
| Calculation Method | Common Deep-Sea RoRo GHG Emission Intensity methodology | Standardized calculation rules aligned with ISO 14083 + GLEC | Carriers, OEMs and emissions-reporting teams | ESTABLISHED |
| Primary Carrier Data | Vessel and operator performance data feeds the calculation system | Fuel consumption, transport work and operating information | Carriers and independent verifiers | ACTIVE |
| Independent Verification | Carrier emissions data can be checked under the GRC methodology | Independently reviewed primary data | Cargo owners requiring defensible Scope 3 numbers | ACTIVE |
| Global Benchmark | Public industry-average intensity: 43.10 gCO₂e/t-km | Aggregated deep-sea RoRo carrier results | Companies lacking carrier-specific data | AVAILABLE |
| Trade-Lane Factors | Emissions-intensity data structured around 27 specific lanes | Primary carrier fuel and voyage information | OEM procurement and logistics teams | DEPLOYED |
| Carrier Comparison | Individual operator factors can be compared with an industry or route benchmark | Consistent methodology reduces calculation differences | Automotive freight buyers | ACTIVE |
| Scope 3 Accounting | Ocean vehicle logistics can feed directly into cargo-owner supply-chain emissions reporting | Tonnes transported × distance × verified emission intensity | Automakers and other RoRo cargo owners | ACTIVE |
| GRC Council | Permanent body overseeing methodology, rules and future changes | Governance Framework and formal data-handling requirements | Entire RoRo data ecosystem | NEW 2026 |
RoRo Emissions & Carrier Benchmark Calculator
Compare the estimated greenhouse-gas footprint of a vehicle shipment using a carrier-specific intensity, the global industry benchmark and an alternative-carrier scenario.
Carrier Emissions Comparison
Estimated shipment emissions using the same cargo mass and distance with three different emission-intensity factors.
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