Summary: Melvyn Bragg and his guests discuss ice ages, periods when ice sheets cover the Earth's Poles. Geological evidence indicates that there have been several in the Earth's history, although their precise cause is not known. Ice ages have had profound effects on the geography and biology of our planet. Melvyn Bragg is joined by Jane Francis, Professor of Paleoclimatology at the University of Leeds; Richard Corfield, Visiting Research Fellow in the Department of Earth Sciences at Oxford University and Carrie Lear, Senior Lecturer in Palaeoceanography at Cardiff University.
