So remove the carrier bags from the equation and people will have to find something else to put the rubbish in for collection, the only thing I can think of is plastic refuse sacks sold in supermarkets. The result is you have simply replaced one type of plastic bag for another and strangely enough, at the same time the government has discovered another opportunity with which to raise taxes under a green banner, but without actually solving the problem. The refuse bags are heavier duty plastic than the carrier bags so will take even longer to degrade when tipped into landfill!!
"Conscience is what makes a boy tell his mother before his sister does". Evan Esar.