posted 9 years ago
I've mulled this same problem, on a couple of different sites. If you look at some of the very early Permaculture literature, I believe Mollison once said that if you bring something onto your site, then be responsible for disposing of it there. Otherwise don't bring it! I recall descriptions of early sheetmulch gardens that included what I would call garbage....plastic, fabrics, and such like!!
In addition, on a rural, remote site, the ecological/carbon footprint of the energy used in backhauling the stuff to a recycling center, in addition to the energy needed to process/melt it back down for reuse.
Personally I have used glass, metal, and hard plastics as fill, usually under something like a paved terrace which is a. not being used to grow anything b. relatively permanent, and c. will save me a lot of work moving the additional fill soil. I have buried bottles, etc. above buried power and water lines, so that anyone digging later (including forgetful me!) will run into them first and catch a clue that something is down there under them. And, of course, I have sunk them all into concrete work, which if a large enough project can absorb a lot of stuff!
In the similar vein of "reuse and sequestration" I've used soft plastics, styrofoam, bubble wrap, as well as fabrics and paper, as insulation in sheds and after remodeling projects in the house itself.