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Since the Single European Act of 1986—when it was enshrined in treaties—European environmental policy has occupied a very particular place. From the outset, with what is known as the integration or coherence clause, its scope and reach have gone far beyond the Union’s traditional policies. In 1992, the Maastricht Treaty marked a turning point, incorporating the precautionary principle as one of the guiding environmental principles and giving it a considerable amplifying effect. Finally, since the Green Deal (2019) and the subsequent cascade of projects, the environment has surpassed what might be called transversality to become the keystone of the Union’s policies and actions. The Court of Justice is firmly behind this upward trend.