120Furthermore, an appropriate assessment of the implications of a plan or project implies that, before the plan or project is approved, all the aspects of the plan or project which can, either individually or in combination with other plans or projects, affect the conservation objectives of that site must be identified, in the light of the best scientific knowledge in the field. The competent national authorities are to authorise an activity only if they have made certain that it will not adversely affect the integrity of that site. That is so where there is no reasonable scientific doubt as to the absence of such effects (judgment of 7 November 2018, Holohan and Others, C‑461/17, EU:C:2018:883, paragraph 33 and the case-law cited).
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