I still don't understand what people have against putting plastic in landfill.
In developed countries they are well sealed, so you're not getting groundwater contamination, and they're eventually topping off and can be used for pasture or a park.
Specifically for PLA, there's the issue of methane I linked in my reply to your other comment. For other plastics, the problem I see with landfilling is mostly that you spent a lot of energy creating this material, and now you're throwing it away and spending that energy again to create more. On top of just being wasteful, and emitting a bunch of carbon, all that material production is also funding an industry that is hellbent on destroying the planet.
