Ice RiversThe story of one woman's passion for glaciers. As one of the world's leading glaciologists, Professor Jemma Wadham has devoted her career to the glaciers that cover one tenth of the Earth's land surface. Today, however, these 'ice rivers' are in peril. High up in the Alps, Andes and Himalaya, once indomitable glaciers are retreating; in Antarctica, meanwhile, thinning ice sheets are releasing meltwater to sensitive marine food webs, and may be