Comment Re:Moon rocks (Score 1) 150
It is easy to get out of the earth-moon gravity well from the moon with a sled, but your load will still be stuck in a solar orbit similar to the Earth's.
To divert an asteroid, you would need to catch it early, on a near-miss pass of the Earth, and even then the orbit will still intersect our orbit.
If we detect a large object on a direct collision course, launching rocks at it from the moon is about as useful as throwing rocks by hand at an incoming ICBM.