The Roof, the Roof, the Roof is in Bloom - Green Busi...

The Roof, the Roof, the Roof is in Bloom

The Roof, the Roof, the Roof is in Bloom
By Marc Peruzzi & Pieter van Noordennen
May 21, 2009
Entrepreneur.com

"A Philadelphia firm is turning tar paper and concrete into vast urban meadows."

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