If we have access only to those corporeal materials which occur on this earth, along with the occasional meteor (a naturally occurring object in space) which crashes through our atmosphere to become part of the earth, and if though we be empowered to manipulate naturally occurring materials, but are incapable of eliminating or changing anything really, then is any matter really inorganic or unnatural?
It is a fallacy to claim that any substance manufactured by humanity or nature (since humanity itself is a naturally earthy phenomenum) can be unnatural or inorganic. Even my granddaughter's plastic doll is organic and will in due time recycle--remix--as natural processes intercede and act upon it.
We worry way too much...