Court of Justice 21 May 2008, C-127/07 (Société Arcelor Atlantique et Lorraine and Others v Premier ministre, Ministre de l’Écologie et du Développement durable and Ministre de l'Économie, des Finances et de l'Industrie.)

Opinion of the Advocate-General Opinion of the Advocate-General 1. The question which forms the subject of this reference for a preliminary ruling relates to the compatibility with the principle of equal treatment of the scheme for greenhouse gas emission allowance trading introduced by a Community directive and involves the performance of complex assessments of fact.