Peter Wadhams, professor emeritus of ocean physics at Cambridge University, is a sea ice specialist with 46 years of research on sea ice and ocean processes in the Arctic and Antarctic. In more than 50 expeditions to both polar regions, he has worked from ice camps, icebreakers, and aircraft. He also has traveled six times on Royal Navy submarines under frozen north polar seas to conduct research. His new book is "A Farewell to Ice: A Report from the Arctic."