Smoking in public seems a bit extreme, but for instance smoking in bars/restaurants was introduced in the country where I lived first in 2006 and tightened in 2011 but a lot of bars still just kept doing it. Especially in small villages. Until some of them were fined; the fines are so high that they basically have to close and have debts after that. Even for 'rich' people this is a too much. Since a few of those were made public, no-one dares to do it anymore. But in public seems ... very hard to enforce.
So one would think, with plastic, just fine the people giving/selling the plastic bags. If you give/sell a non degradable plastic bag it has to carry a return deposit of $25 per bag or you get fined, as a shop, $200k. Plastic bags will be gone in no time flat. Far easier to enforce and too rich, also for the rich. Good for companies and the world as they can sell paper bags and biodegradable bags.
So one would think, with plastic, just fine the people giving/selling the plastic bags. If you give/sell a non degradable plastic bag it has to carry a return deposit of $25 per bag or you get fined, as a shop, $200k. Plastic bags will be gone in no time flat. Far easier to enforce and too rich, also for the rich. Good for companies and the world as they can sell paper bags and biodegradable bags.