Here in Sacramento, CA (USA) we have a 10-cent charge for plastic bags at the grocery store. It's very common for people to bring their own bags. It has encouraged me to reuse bags or minimize their use.
Back where I used to live in the South, plastic bags were free and I used way more.
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"You have a responsibility to consider all sides of a problem and a responsibility to make a judgment and a responsibility to care for all involved." --Ian Danskin