SIR: Ray Evans’ article “The Chilling Costs of Climate Catastrophism” (June 2008) was quite disappointing. I am disturbed about his criticism of Ross Garnaut. Evans criticises Garnaut, as a policy adviser, for using the IPCC report as a source. How could Garnaut do anything else? Even Steven McIntyre, perhaps the best-known critic of the IPCC report, has said that if he was advising government, he would base his advice on the IPCC report. Ray Evans should have picked up on two key aspects of Garnaut’s work. In one of Garnaut’s first statements he pointed out that the IPCC conclusions were…