I hadn’t heard of James Balog, whose work is the subject of ‘Chasing Ice’, until I saw him give a presentation at TED Global in Oxford in 2008. It was in a session after supper, along with Nigeran novelist Chimamanda Ngozi Adichie, an evening optional extra for anyone who still had any headspace after a day of back-to-back talks. I didn’t know anything about James’ project, the Extreme Ice Survey. What he shared that night was so powerful that I was unable to sleep. Unlike much that one might read about climate change, the debates, the research, the statistics which appeal to our rational mind, Balog’s work was visceral. You could feel it in your stomach. It haunted you, while at the same time stunning you with its breathtaking beauty. That’s a powerful combination, and it is that combination that makes ‘Chasing Ice’ such an extraordinary and vital film.