Book and claim for maritime decarbonization: momentum and fragmentation

The Book & Claim model for maritime decarbonization is gaining significant momentum, driven by new accounting standards, buyers alliances, and corporate Scope 3 targets. The model successfully bypasses the physical logistical barriers of bunkering and transporting alternative fuels by separating environmental attributes from physical molecules.

However, the market is characterized by high complexity, inconsistent guidelines, and divergent additionality frameworks. For corporate buyers, this fragmentation creates a steep learning curve and shifts a substantial due diligence burden onto procurement teams.

This report evaluates the core market risks, compares major registry frameworks, and outlines how the Carbon3 platform resolves these barriers through an audit-ready, institutional-grade market infrastructure.