Degradeable plastic has been in use for decades in the vegetable growing business. The raised beds that you see in fields growing vegetables are often covered with the kind that degrades and just goes away in a matter of months. I would think it a short step to make plastic shot cups out of something similar.
I struggle to accept that the breakdown of any product based on plastic will "just go away"..... out of sight , and out of mind springs to mind; although the material will degrade and breakdown ultimately into very small particles, I believe that research has established this particulate uptake and accumulation in microrganisms, terrestrial and marine. Something to cause concern? Probably not of immediacy for our generation but who knows for those in the long term.
