What is the height of towers at Sky Greens vertical farm? [br] [originaltext]

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 Chinese cabbage are grown, stacked in greenhouses, and sold at local supermarkets. The farm was built in 2009 and since October this year the fully operating farm has been supplying one of city’s supermarkets with weekly deliveries of its greens. The Sky Greens produce costs around 40% more than an imported equivalent. However, the small amount of energy and water needed to grow the vegetables, and the close proximity to the consumer, means that carbon dioxide emitted in production and transportation is kept to a minimum. The Sky Greens venture is supported by the Singaporean government and has another advantage over other urban farms around the world: abundant natural heating and light. Singapore has year-round temperatures of around 30 degrees Celsius and the farm is set in an open area, designated by the government as an agro-technology park, miles away from the shadow of city skyscrapers. And there are plans for the current site to expand to produce up to two tons of greens a week next year and build over 2,000 towers in the next few years.