Our world is awash in litter, with a monstrous gyre of floating plastic swelling in the Pacific Ocean, bottles and cans cluttering our roadsides, and blighting even the most remote and beautiful Chesapeake Bay islands and wetlands.One response to this: more than 100 cities and counties across the U.S. have banned Styrofoam cups and food containers. These included the District of Columbia last year, along with suburban Montgomery and Prince George’s counties...