04 August 2025
Sea-Level Rise Reaches The Hague
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. Continue reading >>
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01 August 2025
Human Rights in the ICJ’s Climate Opinion
This summer has seen two major climate advisory opinions published – first from the Inter-American Court of Human Rights, and then from the International Court of Justice (ICJ). Both opinions address human rights law, embedding human rights in a broader overarching framework of international law that also includes international climate treaties and customary international law. But how do these opinions compare, and what room does the ICJ leave for continuing development of human rights standards by other relevant courts and treaty bodies? Continue reading >>
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01 August 2025
The Ruling and the Mirror
Much of the commentary that has emerged so far, in this symposium and in seemingly every other corner of the internet, focuses on the legal content of the opinion: the articulation of States’ obligations under international law, the rejection of the lex specialis argument, and the recognition of the right to a healthy environment, inter many alia. Yet beyond the legal reasoning and doctrinal outcomes lies something else. The opinion is also an act of identity performance: a way for the ICJ to speak about itself. Continue reading >>
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30 July 2025
What the Court Didn’t Say
The aim of this blog post is not to summarise the ICJ’s opinion or assess its overall relevance for international law. Instead, it draws attention to some of the issues that the ICJ did not address, or where it might have gone further, by providing more depth, precision, and guidance. By focusing on what the ICJ did not say, we can gain a better understanding of how it navigates its institutional constraints, political sensitivities, and the evolving terrain of international climate litigation. Continue reading >>
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30 July 2025
A Right Foundational to Humanity’s Existence
For the second time in a month, one of the world’s highest judicial authorities has issued an advisory opinion on the climate crisis that highlights the importance of the human right to a clean, healthy and sustainable environment. Echoing the Inter-American Court of Human Rights in its Advisory Opinion 32/25, on July 23, the International Court of Justice (ICJ) unanimously held that this right constitutes a binding norm of international law. Continue reading >>
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27 July 2025
International Rulings and the UK–Mauritius Chagos Agreement
On 22 May 2025, following negotiations that began in November 2022 and a joint statement of 3 October 2024 (to learn more, see Sebastian von Massow), the United Kingdom and Mauritius concluded an Agreement, stating that “Mauritius is sovereign over the Chagos Archipelago in its entirety, including Diego Garcia” (Article 1). The Chagos Agreement is not only a diplomatic achievement, but also a “contractual transposition” of the decisions of international courts and tribunals. Continue reading >>
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15 June 2025
“Almost Genocide”
Genocidal intent does not necessarily pop, prefabricated, out of the perpetrator’s state’s head. It emerges – gradually, often unevenly – as a product of action, omission, emotion, and political opportunity. A war that once had legal justification as defence can thus harden into something else: the destruction of a group as such. This is as true in the specific conditions of Gaza, as it is as a matter of principle. Continue reading >>
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06 June 2025
Migrant “Instrumentalisation” before the ICJ
On 19 May, Lithuania introduced proceedings against Belarus before the International Court of Justice for the alleged smuggling of migrants. Lithuania claims that Belarus violated provisions of the Protocol against the Smuggling of Migrants by Land, Sea and Air, which supplements the UN Convention against Transnational Organized Crime. This blog will detail several difficulties with Lithuania’s argument which seeks to collapse key differences between migrant smuggling and the practice of migrant “instrumentalisation”. Continue reading >>
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04 June 2025
Genocide in Gaza?
“Israel is committing genocide in Gaza.” This was the claim raised by South Africa before the International Court of Justice (ICJ) in The Hague just two and a half months after Hamas' large-scale terrorist attack on Israel on October 7, 2023. South Africa alleges that Israel's military counteroffensive is not (primarily) directed against Hamas, but rather aims to destroy the group of Palestinians in Gaza as such. This accusation carries significant political and legal weight. However, proving the necessary intent to destroy is difficult; it should not be accepted lightly. At any rate, as Israel's warfare continues and becomes increasingly brutal, the evidence for genocide is mounting. Continue reading >>11 April 2025
“Those with the Guns Are the Last to Starve”
Five Questions to Tom Dannenbaum Continue reading >>
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