The world will not end, at least not for the conceivable future.
How do I know this?
Because the only way that will happen is if WE destroy it before the sun does, and we, as residents, have a vested interest in not allowing that to happen.
Yea yea, I know a lot about politics, and it has a way of righting itself even as it maintains the positive virtues of the misguided.
The only way the world comes to an end is thru a super nova, and that is not happening for eons.
Forget about meteors, they pose little (if any) threat.
Comets, on the other hand, are more formidable, but mathematically predictable, and we are a lot smarter than most people think.http://rosetta.jpl.nasa.gov/news/touchdown-rosettas-philae-probe-lands-comet
Now, although we can, let's not go blowing them up willy nilly. This will produce huge fragments who's mathematical course we do not know.