Opinion of Advocate General Kokott delivered on 16 January 2020.#A.m.a. - Azienda Municipale Ambiente SpA v Consorzio Laziale Rifiuti – Co.La.Ri.#Request for a preliminary ruling from the Corte suprema di cassazione.#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.#Case C-15/19.