As you read this, humanity is merely 85 seconds away from disaster. This week, leading experts set the Doomsday Clock, a stark symbol of scientific worries about humanity’s, well, doom. Wars, climate change, disruptive technologies, and authoritarian governments, among other things, prompted them to set it to 85 seconds to midnight. It is the gravest outlook ever on Earth’s future from the timepiece’s creators, a nonprofit called the Bulletin of the Atomic Scientists. But does this mean you need to grab your toilet roll and Google your nearest bunker? What would happen if the Doomsday Clock struck midnight? Let’s say…