While the U.S. has a long way to go to catch up with the estimated 12% of flat-roofed German buildings that are covered with vegetation, experts are confident that the American movement will continue to expand, especially since it's a potential lucrative market for landscape contractors and designers, architects, and nurseries. Dr. Brad Rowe, Associate Professor of Horticulture at the Michigan State University Green Roof Research Program, built this green-roofed shelter for his dogs, Finn and Cooper.
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