The pronounced warming trend in the south lattitudes depicted in Santer [1995b] (our ‘mirror in the sky’), and given as distinctive of the human signal, is the result of a careful selection of the time-range of data used (1963-88) according to a letter by Michaels and Knappenberger published in Nature on 12 Dec 1996 in response to the Santer paper appearing there in July.
Chart from ‘Human effect on global climate? Letter to Nature Vol 384 12 Dec 1996, by Michaels and Knappenberger.
