For 55 years, Baltazar Ushca has trekked over 10 km up the tallest mountain in Ecuador. He hacks away at glacial ice and breaks it into blocks, which he wraps in hay and loads onto his donkeys' backs. On Saturdays, he sells the ice at the market for $2.50 a piece, to vendors who turn it into ice cream and fruit juices. Baltazar is now the last remaining ice merchant; when he dies, the tradition of harvesting glacial ice will be lost forever.