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Russell Schweickart, a former Apollo 9 astronaut, compared the asteroid threat to that of space debris hitting the International Space Station, which he said is “small enough that we can move it out of the way.”
The technology exists that would effectively allow scientists to send a craft into space to rear-end an asteroid, and slightly change its velocity.
“We can’t move the Earth, (so) we have to go up and change the orbit of the asteroid,” Schweickart said. “It’s the same problem, all relative motion, but it’s a massive undertaking.

Astronauts: Asteroid threat calls for teamwork - ap / yahoo news

that’s such a brilliantly simple solution, i’m surprised i haven’t heard it before.  much better than nuking the thing, which on the scale of armageddon would transfer a single massive impact into a cloud of buckshot.