134It follows from the Court’s case-law that the requirement of an appropriate assessment of the implications of a plan or project under Article 6(3) of the Habitats Directive is conditional on there being a likelihood or a risk that the plan or project will have a significant effect on the site concerned. Having regard to the precautionary principle, in particular, such a risk is deemed to be present where it cannot be ruled out, having regard to the best scientific knowledge in the field, that the plan or project might affect the conservation objectives for the site. The assessment of that risk must be made in the light, in particular, of the characteristics and specific environmental conditions of the site concerned by such a plan or project (see, to that effect, judgment of 17 April 2018, Commission v Poland (Białowieża Forest), C‑441/17, EU:C:2018:255, paragraphs 111 and 112 and the case-law cited).
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