29As regards the establishment of thresholds or criteria to determine whether such a project must be made subject to an environmental impact assessment, it must be borne in mind that, indeed, Article 4(2)(b) of Directive 85/337 confers a measure of discretion on the Member States in that regard. However, that discretion is limited by the obligation set out in Article 2(1) of the directive to make projects likely, by virtue inter alia of their nature, size or location, to have significant effects on the environment subject to an impact assessment (see, to that effect, WWF and Others, paragraph 36 and the case-law cited).
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