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Human impact or natural variability? The conundrum of climatic change presented by Emeritus Professor Martin Williams. Climate change is the subject of a great deal of discussion, some of it neither well informed nor constructive. There is a need for dispassionate debate and for information that allows the individual to make a considered judgement. Such information needs to be accurate, up-to-date, and easy to grasp. These requirements provide the context for this talk. Thursday 5 September, 6.30 pm. Mawson Lecture Theatre, Mawson Building North Terrace campus.