49As regards the elements of Directive 2003/87 which must be categorised as essential within the meaning of the provisions and case-law cited in paragraphs 46 to 48 of the present judgment, it must be pointed out that, although the principal objective of that directive is to reduce greenhouse gas emissions substantially, that objective must be attained in compliance with a series of sub-objectives. As indicated in recitals 5 and 7 of that directive, those sub-objectives include the safeguarding of economic development and employment and the preservation of the integrity of the internal market and of conditions of competition (judgments of 29 March 2012 in Commission v Poland, C‑504/09 P, EU:C:2012:178, paragraph 77; in Commission v Estonia, C‑505/09 P, EU:C:2012:179, paragraph 79; and of 17 October 2013 in Iberdrola and Others, C‑566/11, C‑567/11, C‑580/11, C‑591/11, C‑620/11 and C‑640/11, EU:C:2013:660, paragraph 43).
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