THE Government's green paper on carbon trading uses adjectives like "smoother", "gradual", and "measured" to describe the scheme's implementation, because cutting Australia's emissions by 60% in four decades is going to produce profound structural change, and, inevitably, political repercussions. Like a dentist poised above you, drill in hand, the Government wants to warn us the process will be difficult and reassure us it will be no more painful than is necessary.