by the way, I heard that under certain conditions, bioplastics decompose without releasing harmful substances into the environment ... is this really so or could I understand something wrong?
it is, but we will come to this later. Perhaps if you know about the active element in the production of bioplastics, then you yourself will guess under what conditions there are no harmful substances.
as I recall, is polylactic acid, which is derived from natural sugars (glucose, cane sugar). I dont know other details about her.