Supersized Earth, BBC One, review There were dizzying ascents in Supersized Earth on BBC One, with Dallas Campbell taking the long-since obligatory daredevil presenter role in a three-part series about how mankind has reshaped the planet to suit itself. In this first episode, his ordeals began in Lincoln Cathedral, as he dropped from the tower to the aisle by rope. The look on his face was unmistakeably one of fear, which meant that when he later found himself cleaning windows at the top of the world's tallest building, the Burj Khalifa in Dubai, and said, "I've never been so scared" - it rang true. The documentary's real can't-watch moments, though, came when Campbell descended into the filthy depths of Mexico City's main sewer, hoping to avoid the pathogens present in the scum that floated past the camera lens, which included the last remains of a horse. It was the sort of stomach-churning sequence that the Fifties ad-men who came up with the concept of the TV dinner could surely not have foreseen.