This week, leading experts set the Doomsday Clock, a stark symbol of scientific worries about humanity’s, well, doom. What is the Doomsday Clock? But it’s not a metaphor for a sad blue sky – if the symbolic clock strikes midnight, humanity has failed to prevent an Apocalypse. What would happen if the Doomsday Clock struck midnight? Here are some events from 2025 that scientists said had informed this year’s Doomsday Clock setting:Get in touch with our news team by emailing us at webnews@metro.co.uk.