Asteroids and Earth

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Several things lately about asteroids interacting with Earth. A couple of weeks ago I saw a show in PBS about the asteroid that came in over a town in Siberia at a shallow angle and exploded while still at a high altitude. While it did some damaged it was not as bad as it would have been if it had some in at a more direct angle like the one in 1906 that caused a lot of damaged but if I am remembering right was not over any a populated area. Then I saw the title of an article on line about NASA looking into coming up with a rocket or something to knock a threatening asteroid off course. Now starting tonight there is a TV show, Salvation, with the plot of a devastating asteroid that will hit Earth in 186 days. As I see there are only a few solutions to the problem of a major asteroid heading toward Earth. One is deflecting or blowing it up; another is building a lot of bunkers and hope for the survival of as many people as possible and that there is still the ability on live on Earth in time; another is to try to save some of humanity by having spaceship ready to go that can support life for a very long period of time and either try to reach some other planet or return after Earth has recovered.