We are so doomed if the UN’s plan entails anything from the movies Armageddon, Deep Impact or Meteor (from 1979).
Actually, I think we’ll prefer extinction should lawyers and the insurance industry get involved in the plan. The lawyers know the NEO doesn’t have any assets so their contribution to the treaty will be guaranteeing someone to sue. Meanwhile the even slimier insurance people will make sure they don’t pay any claims because their policies will only cover damage and death caused directly by the killer asteroid’s impact—anything in the immediate crater. The majority snuffed out or horribly injured by the heat (practically everything ignites), collapsing structures, falling glass, shockwave or the ejecta (the projectiles launched from the crater) will be SOL since meteor insurance will be very specific as they parse their language a la Hurricane Katrina, Andrew and Rita.
It’s pretty irritating how Congress is also demanding NASA to do something about this with the paltry budget they’ve been given in addition to putting people on the Moon and Mars this century. For more good feelings about the outcome of a decent-sized NEO hitting the Earth, check out this page courtesy of the University of Arizona.