Trashing plastic bags

Northern Ireland implemented a 5 pence per-bag levy on every plastic bag used in retail stores. Prior to the 2013 introduction of the levy, shoppers used approximately 300 million carrier bags a year, according to my Belfast newsletter. Usage of plastic bags dropped 72% after the levy began.

I'm actually surprised bag usage was that high, because everyone seems to always bring their own shopping bags with them. I guess human behavior can change pretty rapidly.
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