Scenario:

Now in this present age and time we have a limited amount of time to figure out how to stop the impending showers of moon rock that will probably create catastrophic effects on our planet. Most likely essentially wiping us out along with hundreds and thousands of other species. We have a lot of Mass heading right towards us, how will we approach the issue?
Side effects included involve:
Calmer Oceans: Essentially killing the ecosystems that live within them as well
Unstable Orbit: The moon counts for some of our Mass and how we orbit. With the loss of the moon we will go into a crazy orbit around the sun but also have insanely changing seasons.
What do you do? Or what do you think people SHOULD do?