We asked him, in the event that society collapses, what should we do. With all this in mind, the Guardian spoke to the academic and author Nafeez Ahmed, who has studied global crises and mass violence, and recently advised Ubisoft on the authenticity of its post-pandemic video game, The Division.

It was just a bit of fun, and they added plenty of caveats to that figure, but still, something to think about, eh?

In 2008 a group of experts met at an Oxford University conference and suggested that there was a 19% chance of a global catastrophic event before 2100 (with super intelligent AI and molecular nanotechnology weapons at the top of the threat list). Natural and ecological disasters, nuclear weapons, terrorism, experimental technological accidents (“Oops, we’ve accidentally created Skynet”) – they’re all in the game. These days we’re spoiled for choice in terms of potential catastrophes. And the same thing would happen all over the globe. In short, the world would get medieval on America’s ass.

State of survival war tips