Judgment of the Court (First Chamber) of 12 June 2019.#Terre wallonne ASBL v Région wallonne.#Request for a preliminary ruling from the Conseil d'État (Belgium).#Reference for a preliminary ruling — Environment — Directive 2001/42/EC — Assessment of the effects of certain plans and programmes on the environment — Decree — Establishment of conservation objectives for the Natura 2000 network, in accordance with Directive 92/43/EEC — Definition of ‘plans and programmes’ — Obligation to undertake an environmental assessment.#Case C-321/18.