The objective of the model proposed by the European
Community for Emission Trading is to create a tool to monitor
the emission of CO2 directly emitted by single systems installed
in plants (according to the activities listed in enclosure I of
directive 2003/87/CE [6]). Only monitoring CO2 without
considering other GHGs and only monitoring at the single plant
level cannot fully represent all of GHG emissions resulting from
all of the processes of an enterprise.