European Union – Environment. The Court of Justice of the European Union gave a preliminary ruling, deciding that art 24(1) of Decision 2011/278/EU had to be interpreted as not precluding a member state from requiring undertakings which, being subject to the greenhouse gas emission allowance trading obligation within the EU, received a free allocation of those allowances to provide information relating to all planned or effective changes to the capacity, activity level and operation of an installation, without limiting that requirement solely to information relating to changes that would affect the allocation.