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In this photo taken Tuesday, July 12, 2011, a female honey bee carries pollen in her "pollen basket" on her hind leg as she hovers around a purple prairie clover not far from a hive on the rooftop secret garden of City Hall in Chicago. Beekeeping is thriving in cities across the nation, driven by young hobbyists and green entrepreneurs. Honey from city hives makes its way onto swanky restaurant kitchens and behind the bar where it's mixed into cocktails or stars as an ingredient in mead. Membership in beekeeping clubs is skewing younger and growing. The White House garden has beehives. The city of Chicago's hives, nine in all, on rooftops and other government property are just part of the boom.(AP Photo/Charles Rex Arbogast)

Rooftop Gardens

Seen as a positive force for the environment as well as a great way to save money by growing your own dinner, rooftop gardens are blooming in cities over the globe from the WWF building in Washington D.C. to London's East End.