15 One of the Tallest Buildings in the World Gets A Green Roof One of the Tallest Buildings in the World Gets A Green Roof Green Lifestyle  (tags: CoolStuff, design, energy, technology, interesting ) Beth - 18 days ago - care2.com The Willis Tower, formerly known as the Sears Tower, has been an iconic part of the Chicago skyline for many years. And now, thanks to plans for a major energy efficiency overhaul, it may give visitors... add comment send green star

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Beth B.
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