@inthehands this seems pretty obvious, and effective, right?
We have carbon tax for CO2 emissions; all sorts of sin taxes on tobacco and alcohol; related taxes on sugary drinks in some places -- and, very closely related to plastic in general, there's research showing that taxes on plastic bags are very effective: https://www.science.org/doi/10.1126/science.adp9274
This seems like a bog-standard case of increasing the market price to reflect economic externalities...