Thousands of bees buzz in a frenzy, throwing themselves at a man in a protective suit. Clinging to a rope ladder suspended over a cliff, the harvester struggles to balance with every reach towards the bees’ hive. Armed with a long-handled knife, he slices away the outer sections rich with ripe honey, leaving the centre and bottom intact so the larvae inside can survive to sustain the colony. “Because the ladder swings so much, cutting the comb and lowering it safely is a gruelling test that can...