33Moreover, the requirement that the cost should be ‘not prohibitively expensive’ pertains, in environmental matters, to the observance of the right to an effective remedy enshrined in Article 47 of the Charter of Fundamental Rights of the European Union, and to the principle of effectiveness, in accordance with which detailed procedural rules governing actions for safeguarding an individual’s rights under European Union law must not make it in practice impossible or excessively difficult to exercise rights conferred by European Union law (see, inter alia, Case C-240/09 Lesoochranárske zoskupenie VLK [2011] ECR I-1255, paragraph 48).
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