Rank: Guru
Rating: 91%, 49 votes
The green wire you are speaking of is just an earth ground wire. You can either just cap it off with an appropriate sized wire nut or tape which ever you prefer. Or you could just try to attach it to metal on the light fixture if you are sure neither of the other two are attached to the same metal. It is just an earth ground. I hope this helped.
-Andrew Hawkins