It's not that difficult to make plastic from strong sugars. The trick is to make plastic from less expensive weak sugars like wood chips. One company making plastic from wood chips has given up on a quick biodegradable action because of shelf life requirements of food.
Here is another link in the news:
Rather than focus on alternatives to plastic lids on disposable containers, I thought it would be beneficial to have another solution entirely:
Use reusable lunch gear
As a consumer, you can bring a bowl or soup cup with you (or even just a tupperware container with a lid), and ask that your takeaway soup be placed in that instead.
KeepCup offers a similar ...
Plastic films can line paper containers.
But also plastic is being developed that will bio-degrade in any compost situation.
McDonalds dumped their polystyrene cups several years ago. Their rationale was the poor recycling availability of polystyrene.
McDonalds also once made very heavy use of polystyrene foam "clamshells" for presenting their premium burgers. They have switched to either plain wrappers, or lightly built cardboard boxes that I believe are compost ...