The climate emergency is unfolding. Efforts to reduced greenhouse gas emissions globally, including the efforts of the European Union and the Member States, are severely insufficient to hold global warming below the 1.5°C temperature limit. In light of this public institutional failure, civil society actors increasingly resort to strategic climate litigation. However, the EU has very restrictive standing requirements for direct actions against general acts. Therefore, most strategic climate litigation is brought to national courts. In 2023 and 2024, national judges have in several cases allowed defendant states to use EU law as a shield against the litigants’ demands to declare national climate targets and policies insufficient. This Article argues that in light of the fact that EU climate policy is inadequate and nearly impossible to challenge, it is highly problematic when national judges accept EU law to be an obstacle to (full) judicial review. First, EU law itself is not an obstacle to judicial review of national climate policy. Second, the European Convention on Human Rights, read in light of KlimaSeniorinnen, imposes higher requirements on Member States than EU law. Third, the European Court of Human Rights would not accept the “EU law as a shield” argument.

This Article inquires into the aftermath of judgments by the CJEU under the preliminary ruling procedure under article 267 TFEU in cases of strategic litigation. As the principal objective of strategic litigants is to effectively achieve broader societal, political, economic, or legal change, the afterlife of a judgment is crucial for them. While excellent scholarship exists on strategic litigation in EU law, much remains unclear on what happens to a case after the Court of Justice of the EU (CJEU) has given its judgment. Does the referring court and other national courts faithfully comply with the judgment of the CJEU? Do governments implement the ruling? This Article takes the decision of the CJEU in Landespolizeidirektion Steiermark, which concerns the reintroduction of internal border controls, as case study to inquire into the different factors that affect the implementation of a preliminary ruling that is the outcome of strategic litigation. The main argument in this Article is that the implementation of preliminary rulings is determined by the interplay between three different factors: The role of strategic litigants to initiate follow-up litigation, the receptivity of national courts to comply with a preliminary ruling, and the European Commission’s willingness to enforce a preliminary ruling.

At a time when the European Union and its Member States are constantly adopting measures to combat serious crime and terrorism, particularly through the prism of data protection rules, the CJEU is acting as a bulwark by imposing compliance with strict conditions, thereby encroaching on national rules of criminal procedure, which are initially the responsibility of the Member States. In this contribution, we will examine how and on what basis the Ligue des Droits Humains was able to get the CJEU to rule on the Passenger Name Records Directive, and to what extent this action was indeed “strategic.”