42In the absence of provisions in that directive on the consequences of infringing the procedural provisions which it lays down, it is for the Member States to take, within the sphere of their competence, all the general or particular measures necessary to ensure that all ‘plans’ or ‘programmes’ likely to have ‘significant environmental effects’ within the meaning of Directive 2001/42 are subject to an environmental assessment prior to their adoption in accordance with the procedural requirements and the criteria laid down by that directive (see, by analogy, Case C-72/95 Kraaijeveld and Others [1996] ECR I-5403, paragraph 61; Case C-435/97 WWF and Others [1999] ECR I-5613, paragraph 70; and Case C-201/02 Wells [2004] ECR I-723, paragraph 65).
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