The advisory opinion of the International Court of Justice (ICJ) on the Obligations of States in Respect of Climate Change has already been hailed as a historic contribution to the evolving body of case-law on climate-related international law. The opinion was described as a “historic legal victory for small island states” who remain most vulnerable to climate change. Legal commentators have largely responded positively, highlighting areas where the ICJ was unexpectedly progressive and where it clarified key aspects of States’ legal obligations.
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.
This blog post discusses five points where the ICJ could have provided greater clarity or elaborated in more detail. This is not necessarily a point of critique. Avoiding the most controversial issues allows the ICJ to speak with a single, authoritative voice and mitigates the risk of serious backlash. This exercise of imagining an alternative opinion helps to identify areas where the ICJ could have gone further or addressed the questions (see the request for an advisory opinion) in a more direct manner.
