A quick scan doesn't seem to indicate if this is bio-degradable, so I'm not 100% sure what "sustainable plastic" means. Maybe someone who understands material science better can answer, because to a lay person this just sounds like "we already had plant-based plastics in the form of PLA".
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[ 2.7 ms ] story [ 19.1 ms ] threadI am positive that I'm missing something.
https://pubmed.ncbi.nlm.nih.gov/32660071/