Most plastic can’t be recycled into something usable. Plastic degrades quite a bit with each recycling, leaving a bunch of microplastics behind (same thing with “biodegradable” plastic). It would be better to tax it enough (or ban it) to make it not used in certain applications.

The price stuff can change through taxation that makes new plastic more expensive than recycled plastic.
As we all know, taxation is super popular and has never been controversial, ever.
At the very least flaskepant has worked great for like a century here in Norway. Always kind of surprising when other countries don't have it.
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