In Bolivia, the glaciers are melting. Samuel Mendoza, an old ski lift operator, is looking out of a window on the rooftop of the world. He’s the sole employee of the country’s national ski club, but there’s been no skiing and no snow since 2009. For generations, Samuel’s family has lived and worked in these snowy mountains, but now the snow isn’t falling. While scientists are discussing and measuring ominous changes, Samuel honours the ancient mountain spirits, making the more than nine-mile journey to and from the club’s mountain refuge on Chacaltaya, hoping the snow might come back.