Plastic and metal are recyclable, so You both get a thumbs up from Your friendly neighborhood garbageman!
yeah, but if you don't recycle them and simply throw them away the Plastic will still be around 800,693 years from now littering the landscape with foreign shapes and materials.
The Eloi, being a peacefull society will simply ignore it and step aside. The Murlocks however are going to be pissed. They may pick it up and bean an innocent Eloi aside the skull with it before they eat him. Very dangerous material. Best to stick with a metal theme to be truely environmentaly concious.