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Singapore is taking local farming to the next level, literally, with the opening of its first commercial vertical farm.

Entrepreneur Jack Ng says he can produce five times as many vegetables as regular farming looking up instead of out. Half a ton of his Sky Greens bok choy and Chinese cabbages, grown inside 120 slender 30-foot towers, are already finding their way into Singapore's grocery stores.

The idea behind vertical farming is simple: Think of skyscrapers with vegetables climbing along the windows. Or a library-sized greenhouse with racks of cascading vegetables instead of books.