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Will Baltimore ban plastic bags? The city council is considering a proposal to outlaw the single-use plastic bags that shoppers use for groceries and carry-out.Councilman Bill Henry details his proposal, which includes a tax on alternatives, like paper and compostable bags. He says it’s time for consumers and retailers to change their behavior.Then, how have other countries regulated plastic bags? National Geographic staff writer Laura Parker tells us about international approaches to plastic waste and about the dangers plastic bags pose to marine animals.