[deanhills]

Agreed with @rudra and @LightDestory.  I think humans have done such an excellent job of destroying themselves and their environment already - causing so many species to come to an end.   The threat of an asteroid for me pales in significance to the horrible self-destructive path humans are on at the moment all based on greed, mismanaged Governments, corruption, wars, like maybe a good old asteroid will be a blessing to every one.  It will at least take care of the overpopulation of the earth.