1. Is this actually the case, or just post-hoc justification? Remember when during the pandemic, the lockdowns were justified by "just 2 weeks to flatten the curve"?
2. Most of the time I'm given a plastic bag, it's being used to carry something back to my home. Under that scenario, there's basically a 0% chance that it's going to "become litter and pollute the environment". If litter was actually the concern, you'd expect the bans to be targeted at stores where goods being sold don't end up going to homes (fast food resturants and gas stations maybe?), but that's not what we're seeing.