Case C-182/10: Judgment of the Court (Fourth Chamber) of 16 February 2012 (reference for a preliminary ruling from the Cour constitutionnelle (formerly Cour d’arbitrage) (Belgium)) — Marie-Noëlle Solvay and Others v Région wallonne (Assessment of the effects of projects on the environment — Concept of legislative act — Force and effect of the guidance in the Aarhus Convention Implementation Guide — Consent for a project given without an appropriate assessment of its effects on the environment — Access to justice in environmental matters — Extent of the right to a review procedure — Habitats Directive — Plan or project affecting the integrity of the site — Imperative reason of overriding public interest)