(CNN) -- Less than 20 miles from Singapore's skyscrapers is a completely different set of high-rise towers.
Much smaller in scale but with a big ambition, over 100 nine-meter tall towers at Sky Greens vertical farm offer a new vision of urban sustainability.
Green vegetables like bak choi and Chinese cabbage are grown, stacked in greenhouses, and sold at local supermarkets. Full story
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Farming in the sky in Singapore - Asia Times Online
