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The drop in paper and plastic bag usage at food and alcohol stores since Washington, D.C., implemented a bag tax in January 2010. Montgomery County, Md., just passed a similar tax.

The drop in paper and plastic bag usage at food and alcohol stores since Washington, D.C., implemented a bag tax in January 2010. Montgomery County, Md., just passed a similar tax. 

Caroline Cournoyer is GOVERNING's senior web editor.