The ICJ’s application of customary international law to climate change mitigation

Mayer, B. ORCID: https://orcid.org/0000-0002-0669-7457 (2026) The ICJ’s application of customary international law to climate change mitigation. Journal of Environmental Law. ISSN 1464-374X (In Press)

Abstract/Summary

This analysis of the advisory opinion of the International Court of Justice (ICJ) on climate change focuses on the application of customary international law. The ICJ identifies a customary duty to prevent significant harm to the climate system and some more specific obligations. It notes that these rules apply to every state, irrespective of their participation in climate treaties. What remains less clear to the reader of the advisory opinion, however, is the content of the duty of prevention and, more pragmatically, how courts could assess compliance with this duty. This analysis interprets the advisory opinion as suggesting that courts could rely on a set of indicia to determine whether, as a whole, a state is making efforts consistent with customary international law.

Item Type	Article
URI	https://centaur.reading.ac.uk/id/eprint/128449
Refereed	Yes
Divisions	Arts, Humanities and Social Science > School of Law
Publisher	Oxford University Press
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