hmmmmmmm, describe end of the world.
did a mad scientist blow up the world? or did mass effect 3 get canceled?
either way, it's gonna involve the occupy movement. no one will listen to them, and protests will grow until someone does. the police will react violently, as always, damn jerks, to this rise in protests and somewhere down the line marshal law will be instituted under a dick of a president (in the United states. U.K., you're all ready on your way to a totalitarian state!). then everyone will join the occupy movement in retaliation to marshal law and blood will run through the streets in a full revolution.
while america is going through it's second revolution, it's economy will be undermined which will mean the economy of the rest of the world will be horribly affected more than they are now and riots will break out in europe. not japan, nooooo, i've honestly never heard of a riot anywhere in asia, what's up with that? come on traditionalists and believers of the bushido way, stand up against the opression of modernism like in the last samurai!!! but of course, when the dusts settles north korea will attempt to take over the world in it's time of weakness and probably will get away with some of it until WW3 breaks out to end the rioting.
anyway. that's how it will happen. but i'd like it to be a ice cream and cake asteroid instead.