55Such an interpretation is also consistent with the objective pursued by Directive 2003/87, which, as stated in Article 1 thereof, consists in promoting reductions of greenhouse gas emissions in a cost-effective and economically efficient manner (see, inter alia, judgments of 12 April 2018, PPC Power, C‑302/17, EU:C:2018:245, paragraph 18, and of 17 May 2018, Evonik Degussa, C‑229/17, EU:C:2018:323, paragraph 41).
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