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http://www.cnn.com/2010/TECH/innovation/05/25/airship.biohydrogen.shanghai.expo/index.html?iref=allsearch

here is an excerpt from the article,

"When it's not soaring to an altitude of 6,500 feet and reaching a top speed
of 175 kilometers per hour, the airship is docked in a floating organic farm
which recycles CO2. As with the airship, the farm is completely powered by
renewable energy using solar panels and hydro turbines."