Emissions should be reduced by setting standards and limits for emitters and not by the introduction of an ETS.
Of course the government(s) have the problem that they have to pay an ever growing army of civil servants and they need ever more money to do so. The civil servants in turn are always thinking of ways to complicate issues they are involved in, by introducing more and more regulations, thereby justifying their own position and sense of importance. Eventually the system will collapse under its own weight.
