That's the problem with bans. They create unintended consequences, and those consequences will end up making the environment worse, not to mention that most bans don't take into account scientific evidence and LCAs of bags, which all put alternatives high up the GWP scale. Unless reusable bags are properly reused, they end up becoming a waste issue as well, and that's already happened in many cities that have had studies conducted into the effects of ordinances, namely San Francisco and Austin, TX, which was since lifted last year due to a pre-emption by the Texas Supreme Court, which ruled that plastic bags did fall under the scope of the Texas Solid Waste Disposal Act 1989, which pre-empts all bans on containers on the pretence of solid waste management, so cities can no longer ban bags.