A new durable, biodegradable plastic breaks down in seawater, offering a potential solution to microplastic pollution. This material, based on supramolecular structures, can be tailored for different uses and is fully recyclable, enhancing its environmental benefits. New Sustainable Plastic Res
The point of this research was to avoid even that.
It’s pretty awesome that it even breaks down in soil:
But the problem is that phosphorus and nitrogen are actually bad for aquatic ecosystems: https://www.unep.org/news-and-stories/story/what-phosphorus-and-why-are-concerns-mounting-about-its-environmental-impact