I say we let it hit... doesnt that YouTube vid make the impact look like fun???
But if we HAVE to evade it, dont we have like... 26 milion nukes??? Itd be a great way to save the world and help disarm it as far as nuclear weapons. I know that causes fragments, but really, whats the likelyhood of moving it? Or maybe we could use said nukes to cause a control explosion on the surface of the asteroid deflecting it... really, you only have to deflect them a tiny bit, dont you? Considering they will continue going in the direction you deflect them due to there not being friction in space...