Peter Wadhams, Doctor of Science, is a Reader In Polar Studies at, and formerly the Director of, the Scott Polar Research Institute, University of Cambridge. His research interests are sea ice and polar oceanography. He has led numerous expeditions to the Arctic and Antarctic., Julian Dowdeswell is Director and Professor at the Centre for Glaciology, University of Wales, Aberystwyth He is a glaciologist who has worked extensively in the Arctic, particularly in Spitsbergen and Franz Josef Land., Andrew N. Schof ield is Professor of Civil Engineering at the University of Cambridge. He has developed centrifuge methods for geotechnical problems affecting ice.