SAN FRANCISCO – MARCH 28: People walk with groceries in plastic bags in Chinatown on March 28, 2007 in San Francisco, California. The Board of Supervisors in San Francisco approved groundbreaking legislation to outlaw plastic checkout bags at large supermarkets in about six months and large chain pharmacies in about a year. The ordinance is the first such law in any city in the United States and has been drawing global scrutiny this week. (Photo by David Paul Morris/Getty Images)
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