National Geographic : 2009 May
• Wasted space in the modern metropolis may become productive "farmland" thanks to advances in waterproofing green roofs. Some of the rice used to brew Japan's popular Hakutsuru sake grows atop the company's Tokyo office (above). A chef at Vancouver's Fairmont Waterfront hotel harvests apples ripening among skyscrapers. Hotel accountants say the roof garden produces fruits, vegetables, herbs, and honey worth about $16,000 annually.