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.

Wenn Städte sterben

Zerstörte Städte sind mehr als Trümmer. Sie sind gezielte Angriffe auf soziale Vielfalt und urbane Identität. Der Begriff „Urbizid“ rückt diese systematische Vernichtung ins Zentrum völkerrechtlicher Debatten. Doch das geltende Recht greift zu kurz: Zwischen Eigentumsschutz und Kriegsverbrechen bleibt eine Schutzlücke. Könnte ein neuer völkerstrafrechtlicher Tatbestand für den urbanen Lebensraum diese Leerstelle endlich schließen?

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.

Keine Sache der Exekutive

Mit Urteil vom 15. Juli 2025 hat das BVerfG die Verfassungsbeschwerde der Neffen eines jemenitischen Geistlichen, der im August 2012 durch einen US-amerikanischen Drohneneinsatz getötet wurde, verworfen. Das Gericht erkennt mit diesem Urteil zum ersten Mal die Möglichkeit einer Schutzpflicht auch in einer reinen Auslandskonstellation an – selbst, wenn die Gefahr von einem anderen Staat ausgeht. Hier soll ein Blick darauf geworfen werden, inwieweit Gerichte exekutive Völkerrechtsauffassungen einer umfassenden Kontrolle unterziehen können. Das Gericht vergibt die Chance, der ausdrücklich als staatlicher Schutzauftrag operationalisierten Völkerrechtsfreundlichkeit auch Zähne in Form gerichtlicher Kontrollierbarkeit zu verleihen.

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.

Enhanced Due Diligence

The IACtHR establishes that States have a series of obligations to ensure a healthy environment and climate, and prevent violations of human rights. To this end, the IACtHR develops the standard of enhanced due diligence as a binding framework for State action. This standard includes elements aimed at ensuring that the response to climate change is effective, fair, transparent, and evidence-based (para. 224). This blog post discusses the heightened due diligence standard, as clarified by the IACtHR, and outlines nine key elements of this standard.

What We Lost in the Skies Above Tehran

The damage that Merz and Steinmeier have inflicted on both Germany’s international credibility and the order put in place with the founding of the United Nations will likewise be felt for decades to come. As things stand right now, as far as the jus contra bellum is concerned, there might not be much left to reconstruct when the community of international law scholars meets up in Berlin in September. In that, the realists may find reason to rejoice. They, too, will come to miss it once it’s gone.

Respect for International Law in Gaza

Since October 2023, a group of eminent Israeli international law scholars has written numerous letters and memos expressing concerns over many aspects of the Gaza war. Given the importance of these documents both in doctrinal terms and in highlighting the work of these colleagues, we have asked to publish them. So far, only one of the letters has been officially published. Readers interested in more detail can access the full text of the respective documents, which are hyperlinked and archived on Verfassungsblog.

Protecting Rights in the Anthropocene

On July 3, 2025, the Inter-American Court of Human Rights (IACtHR) issued its long-awaited Advisory Opinion No. 32 (AO-32/25) on the “Climate Emergency and Human Rights”. With its opinion, the IACtHR became the first human rights monitoring body to recognize that a healthy climate is an autonomous and justiciable human right. This blog post traces the emergence of this new right within the Inter-American Human Rights System (IAHRS) and highlights its most transformative elements for theory and practice.

Vertrauen und Vertretbarkeit

Das BVerfG hat mit Urteil vom 15.07.2025 eine völkerrechtliche Verantwortung Deutschlands wegen der von der US-Air-Base Ramstein geflogenen Drohnenangriffe zurückgewiesen. Dennoch bestätigt das Urteil, dass es grundrechtliche Schutzpflichten des deutschen Staates gegenüber Ausländer*innen im Ausland geben kann. Damit ist es auch für die derzeit hochumstrittenen Genehmigungen von Waffenlieferungen an Israel von großer Bedeutung.