From Static Assessment to Adaptive Environmental Regulation: Digital Twins in Environmental Impact Assessment (EIA) Law in Nigeria and South Africa

Abstract

Environmental digital twins are increasingly proposed as instruments of
anticipatory environmental governance, yet their legal place within
Environmental Impact Assessment (EIA) remains unsettled. The difficulty is
chiefly institutional, not merely technical: EIA regimes in Nigeria and South
Africa are organised around discrete reports and one-off authorisation
decisions, whereas digital twins produce iterative, probabilistic, and
continuously updated outputs. This article examines the conditions under which such outputs may be incorporated into EIA without compromising legality, procedural fairness, or accountability. It argues that the key distinction is between admissibility and evidentiary weight: model outputs may properly enter the administrative record yet remain too uncertain, opaque, or insufficiently validated to justify significant regulatory consequences. Using Nigeria and South Africa as comparative case studies, and drawing on examples from the Limpopo basin, Nigerian coastal pollution, and municipal waste-routing in Tshwane, the article develops a framework for disciplined integration. Digital twins, it contends, should enter EIA through certified simulation reports, auditable provenance, structured disclosure obligations, and proportionate trigger-based responses, rather than through assertions of technological authority. Properly constrained, they may nable more adaptive regulation; unconstrained, they risk importing technical opacity into already fragile administrative systems.