Judicial cooperation in environmental matters is a key aspect of the move towards environmental democracy undertaken by the European Union. This Article presents the preliminary findings about the kind of behaviour that national courts can show with their judgments once they received a preliminary ruling from the Court of Justice of the European Union, so-called follow-up judgments. It first shows the results of the latest two empirical studies, namely that Italian and Belgian courts tend to cooperate fully with the Court of Justice in environmental matters. Besides, only one new category of judicial cooperation is highlighted, that of suspended cooperation. The unfolding of the categories of judicial cooperation seems to have reached the saturation point.