The “migration” of Future Generations from a moral to a judicial context represents a captivating development in contemporary legal discourse. Recent years have seen a surge in courts across various nations addressing the intersection of future generations and climate litigation. This nexus, far from being coincidental or sporadic, epitomizes a deeper societal and legal dilemma that necessitates a nuanced articulation for effective resolution. The main objective of this Article is to provide preliminary insights for contextualizing this legal evolution. Initially, the Article delineates the journey towards social legitimacy of climate science. Subsequently, it examines the impact of this social legitimation on judicial rulings, particularly observing an emerging trend in climate litigation to expand the temporal scope of legal relevance. The Article culminates in an exploration of the possible interplay between the legal significance of future generations and the extension of the law’s temporal horizon. This conjectural postulation is substantiated through select historical precedents.

Intertemporal law governs the applicability of international legal norms ratione temporis. According to often used terminology, intertemporal law has two different branches. This article provides clarification of the so-called ‘second branch of intertemporal law’. It does so by refuting two commonly held assumptions. First, as established in section 2 of the article, the second branch of intertemporal law is not an exception to the first branch of that law. It cannot be, since both branches of intertemporal law centre on the same legal principle: an action or a factual state of affairs must be assessed in the light of the law which is contemporary with it. Secondly, as implicated by the line of reasoning in section 2, and further confirmed by the inferential evidence cited in section 3, the practical relevance of the second branch of intertemporal law is not confined to the application of the law on the acquisition to territory. It pertains to a more widely defined group of norms in international law.