Case C-15/19: Judgment of the Court (Second Chamber) of 14 May 2020 (request for a preliminary ruling from the Corte suprema di cassazione — Italy) — AMA — Azienda Municipale Ambiente SpA v Consorzio Laziale Rifiuti — Co.La.Ri. (Reference for a preliminary ruling — Environment — Waste — Directive 1999/31/EC — Existing landfill sites — Period of responsibility for after-care of the landfill following closure — Extension — Costs of the landfill of waste — Polluter pays principle — Temporal scope of the directive)