There already are enzymes that degrade PET. Some of them are engineered, some are naturally sourced from fungi (maybe also bacteria) The challenge for wider ad

There already are enzymes that degrade PET. Some of them are engineered, some are naturally sourced from fungi (maybe also bacteria) The challenge for wider adoption of this tech (as in most things in biology) is the upscale. The cost of collecting, cleaning the feedstock, producing the enzymes and essentially running the bio-factory is much higher than the output material, which in the case of PET hydrolysis is terephthalic acid (TPA) and ethylene glycol. Even when considering that the monomers can be polymerized back to PET and complete the cycle, but the price of PET is so cheap, that this is still economically inviable.