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The duty to know: monitoring, reporting and verification as an obligation of due diligence in the legal protection of blue carbon ecosystems

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Blue carbon ecosystems—mangroves, tidal marshes, and seagrass meadows—are increasingly central to national climate strategies, yet their legal protection under international law requires further clarification. Emerging jurisprudence highlights a critical “epistemic conditionality”: States are obligated to *know* the condition of these ecosystems, and protection hinges on their ability to provide legally verifiable proof. This article analyzes this obligation, demonstrating that monitoring, reporting, and verification (MRV) extends beyond climate policy, fulfilling binding duties under the United Nations Convention on the Law of the Sea.
The duty to know: monitoring, reporting and verification as an obligation of due diligence in the legal protection of blue carbon ecosystems

The escalating role of blue carbon ecosystems – mangroves, tidal marshes, and seagrass meadows – within national climate strategies highlights a critical, and often overlooked, legal dimension. This recent article compellingly argues that the protection of these vital habitats isn't primarily a matter of substantive environmental law, but rather an “epistemic conditionality” – a legal obligation to *know* their condition and generate verifiable proof of that knowledge. This shift underscores the profound influence of data and monitoring capabilities on the very enforceability of conservation efforts. The complexities are further illuminated by considerations for data-centric capacity development, as discussed in [Considerations for data-centric capacity development in support of the clearing-house mechanism of the BBNJ agreement] and the practical challenges of international cooperation, as evidenced by recent naval exercises and geopolitical tensions, such as those detailed in [Philippine Navy & Chinese Warship Exchange Radio Challenges Near Disputed Sabina Shoal During Naval Exercise With U.S & Australia]. The legal framework, as the article meticulously outlines, has evolved to prioritize this evidentiary requirement, shifting the focus from simply declaring protection to demonstrating its measurable impact.

The analysis presented is particularly noteworthy for its dissection of the United Nations Convention on the Law of the Sea (UNCLOS) and the newly implemented BBNJ Agreement. The article’s claim that MRV – monitoring, reporting, and verification – isn't merely a climate policy tool but a core element of binding obligations under UNCLOS is a significant reinterpretation, supported by recent advisory opinions from international tribunals. The BBNJ Agreement’s modernization of this architecture, extending its reach into national jurisdictions, further solidifies this evolving legal landscape. The author’s highlighting of “epistemic conditionality” – where protective benefit is skewed towards states with the capacity to generate legally cognizable proof – is a crucial observation. This raises concerns about equitable access to data collection and analysis resources, potentially exacerbating existing disparities and hindering truly global ocean stewardship. The argument for a doctrinal reconstruction of Articles 204 and 205 within UNCLOS, alongside the admissibility of algorithmically derived earth observation evidence, represents a forward-thinking approach to reconciling established legal frameworks with the rapidly advancing capabilities of remote sensing technologies.

The implications of this shift are far-reaching, demanding a re-evaluation of how we approach blue carbon protection. Traditionally, conservation efforts have focused on establishing protected areas and implementing management plans. While these remain essential, this article emphasizes the equally critical need for robust, validated data to underpin these actions. The ability to generate and present verifiable evidence of ecosystem health and carbon sequestration becomes a prerequisite for demonstrating compliance with international obligations and securing ongoing support for conservation initiatives. This underscores the importance of investing in integrated data ecosystems, building local capacity for data collection and analysis, and developing standardized methodologies for MRV. The complexities of data sharing and verification, particularly in contested maritime areas, are further complicated by geopolitical factors, as illustrated by incidents such as the naval challenges near Sabina Shoal, demanding a nuanced approach to international collaboration.

Ultimately, the article’s analysis highlights a crucial turning point in the legal protection of blue carbon ecosystems. The focus is shifting from intention to demonstrable impact, demanding a data-driven approach to conservation. The uneven distribution of verification capacity presents a significant challenge, requiring targeted capacity-building efforts and innovative solutions to ensure equitable access to the benefits of blue carbon protection. What remains to be seen is how the international community will address the inherent power imbalances created by epistemic conditionality and whether the promise of the BBNJ Agreement will translate into meaningful support for developing nations to meet these increasingly stringent evidentiary requirements.

Blue carbon ecosystems, comprising mangroves, tidal marshes and seagrass meadows, are increasingly enrolled in State climate strategies, yet the legal basis of their protection under international law remains insufficiently theorized. Blue carbon protection has become an evidentiary problem before it is a substantive one: international law now protects these ecosystems principally by obliging States to know their condition, so that protection is conditional upon a State’s capacity to generate legally cognizable proof, a relationship termed here the epistemic conditionality of blue carbon protection. Combining treaty interpretation under Articles 31 and 32 of the Vienna Convention, analysis of recent jurisprudence, and comparative normative mapping across three regimes, the article advances three claims. First, monitoring, reporting and verification (MRV) is not merely a climate policy technique derived from Article 13 of the Paris Agreement but, following the 2024 and 2025 advisory opinions of the International Tribunal for the Law of the Sea and the International Court of Justice, is the operational content of binding obligations under Articles 192, 194 and 204 to 206 of the United Nations Convention on the Law of the Sea, which are not discharged by compliance with the climate treaties. Second, the BBNJ Agreement, in force since 17 January 2026, modernizes that architecture and, through Article 28(2), reaches activities within national jurisdiction. Third, because verification capacity is unevenly distributed, epistemic conditionality inverts common but differentiated responsibilities, transferring protective benefit towards States able to afford proof. It proposes a doctrinal reconstruction: Article 204(2) as a continuing surveillance duty; Article 205 publication as distinct from transparency reporting; capacity building under UNCLOS Part XIV and BBNJ Part V as a corollary of the duty to know; and admissibility criteria for algorithmically derived earth observation evidence, by extension of the Pulp Mills line.

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