This analysis discusses the advisory opinion requested by the UN General Assembly from the International Court of Justice (ICJ) in April 2023 on the obligations of states in respect of climate change. Although the ICJ’s decision cannot be expected before the autumn of 2024, important procedural anomalies have arisen, which require due regard to ensure that the ICJ can provide its advisory opinion in possession of sufficient information. In particular, firstly, not all Small Island Developing States have been notified by the ICJ and invited to submit written statements and, secondly, the amicus curiae provided by NGOs will be not accessible to the public. This analysis argues that all Small Island Developing States should have the opportunity to take part in the proceedings and the amicus curiae submitted by NGOs to the ICJ should receive proper publicity.