Business Spectator: Professor Ross Garnaut has recommended Australia seek to cut its carbon emissions by between five and 10 per cent from 2000 levels by 2020, and to fix a carbon price — at least in the early years of an emissions trading scheme — at $20/tonne. The recommendation in the long-awaited supplementary draft of his Climate Change Review translates into a cut in emissions of 25-30 per cent per capita, but they go a long way short of calls by the environmental movement and some business …