The world will probably just end without any warning because someone experimented with black holes in their cellar. Honestly, The amount of possbilities there are for the world as we know it (with which I mean human life on earth) to end are far greater than would ever fit into a poll (And even there, the poll shows possibilities that would never result in the end of mankind such as volcanoes, tsunamis and earthquakes, all of which are rather regional).
Also, scientist have spotted more than 150 different asteroids that could take course on earth any time and destroy all life on it. None have so far. Most likely life on earth will end with earth itsself (the end of the sun would only mean the end of life on earth through cooling down, since our sun does not have the mass to result in a supernova, black hole or anything of the kind).
In other words:
oxytamine has written
Nothing will happen. This is all bullshit. People are already destroying everything and killing themselves. No need in judgement day.