dunno about PLA but what about
- vintage chairs. why buy new when you can get some great vintage stuff? even a mix and match look (different styles) looks pretty cool.
- custom make some using local labor and farmed wood (or recycled barn wood)
- aluminum - recylable?
- maybe check with DWR. I seem to remember reading something in one of their catalogs about some products being green.
- IKEA - don’t they have recycled PP chairs?
Of course “super green” is all relative.
R