Prompted by an illness that took her to the brink of death and back, Jemma Wadham recalls 25 years of expeditions around the globe. Speaking to the professor about her new book, Ice Rivers, Shivani Dave uncovers the importance of glaciers – and what they should mean to us. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>
