I guess if you HAVE to give up one thing to recycle, glass would be best because it would seem to be the least damaging to dump in a landfill or at sea, no?
Glass can separated and ground down. Dumped at sea or in the landfill it would not pose a serious long term issue. The problem is that with no economic benefit to separating it the most likely path is treating it like garbage.
Plastic is the devil. Lasts forever. And there is so much of it.
