53In the second place, Article 6(3) of the Habitats Directive also integrates the precautionary principle and makes it possible to prevent in an effective manner adverse effects on the integrity of protected sites as a result of the plans or projects being considered. A less stringent authorisation criterion than that set out in that provision could not ensure as effectively the fulfilment of the objective of site protection intended under that provision (see, to that effect, judgment of 14 January 2016 in Grüne Liga Sachsen and Others, C‑399/14, EU:C:2016:10, paragraph 48 and the case-law cited).