Assuming that plastic ban was carried out (say in china) how would it affect imports and exports, what would the alternatives be, and would it even be feasible? If so, why has no nation even attempted a ban, even if slightly more expensive isn’t aluminium, glass or carton a way healthier alternative?
Everyone else has covered the important stuff, so I’ll cover something less important that is an area of interest of mine.
The toy industry would be devastated - plastics are an incredibly useful material for toys, pretty much all of the technical innovations in the world of toys that don’t have to do with electronic components are drawn specifically from the increasing capabilities of plastics over time. Something as simple as the modern action figure would be far more difficult to produce to the same level of quality if they were forced to use wood or metal exclusively again - the articulation would suffer, the durability would suffer, the ability for that articulation to hold tension over time would suffer, the ability for paint to stay on the figures would suffer, and there’d be a lot more difficulties with avoiding sharp edges and breakage from the forces you can expect children to put their toys through.
Problems like this would exist for basically every single toy on the market - they’ve all benefited massively from plastics, and if there is ever restrictions on the use of plastic (as there probably ought to be) then we’d see a massive devolution in what toy manufacturers are capable of.
Obviously this doesn’t actually matter - the world was fine before action figures and would be fine after them, much as some people like them, and physical toys are arguably on the way out anyway in favor of screen-based entertainment for children (I consider this a bad thing, but, it’s pretty clearly happening.) so a plastic ban may not change much in the end.