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We all know that the levels of carbon dioxide in the atmosphere are increasing, and this is causing global heating and changes to the climate. But what about the past? When were the levels of carbon dioxide last as high as they are now? (Clue - it was a very long time ago.) What was the world like then?

Alan Haywood is Professor of Palaeo-climate Modelling at Leeds University. He will answer these questions, and will explain how we can know anything about the climate in the distant past.