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http://dx.doi.org/10.59704/ca99ffd63031501e https://verfassungsblog.de/law-of-the-sea-in-the-icjs-climate-change-advisory-opinion/ Sea-Level Rise Reaches The Hague - Findings in Relation to the Law of the Sea in the ICJ’s Climate Change Advisory Opinion De Spiegeleir, Antoine Rocha, Armando eng 2025-08-04 electronic resource text/html ddc:342 Advisory Opinion Climate Crisis ICJ International Court of Justice Internationaler Gerichtshof | Den Haag Klimakatastrophe Law of the Sea Small Islands climate change Internationaler Gerichtshof | Den Haag Klimakatastrophe Verfassungsblog Verfassungsblog--2366-7044 CC BY-SA 4.0 The advisory opinion rendered by the International Court of Justice (ICJ) on 23 July 2025 marks a pivotal moment in the articulation of States’ obligations concerning climate change. While based on broader rules and principles of international law, the opinion foregrounded the United Nations Convention on the Law of the Sea (UNCLOS) as a key legal framework relevant to defining States’ climate obligations. As the ICJ itself stated, UNCLOS ‘forms part of the most directly relevant applicable law’ (para. 124). Thus, far from peripheral, the law of the sea emerged as a primary site for interpreting and enforcing States’ climate obligations under international law.