"A paper by Wharton's Jonathan Klick and Joshua Wright suggested thatSan Francisco's eco-friendly ban on plastic bags might actually be killing people. Klick and Wright found that food-borne illnesses in San Francisco increased 46% after the bag ban went into effect in 2007, with no such uptick in neighboring counties. Most likely, the authors concluded, this was due to the fact that people were putting their food into dirty reusable bags and not washing them afterward
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