Wordsworth never met Greta Thunberg. Greta is 16 years old, possessed of the moral certitude of youth, and convinced that the world is ending soon. She is the self-anointed Cassandra to a cold and uncaring world. Parents of teenagers will recognize the animating themes of her recent speech at the UN: adults are stupid, materialistic and greedy, and their thoughtlessness is causing me great distress. Writing in the Spectator, USA, Dominic Green casts a gimlet eye over the culture which produced this “pig-tailed prophet of planetary doom”.