CHICAGO - JULY 19: Willis Tower Planter, part of the Plant Green Ideas Chicago installation, is shown here on July 19, 2013.

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CHICAGO - JULY 19: Willis Tower Planter, part of the Plant Green Ideas Chicago installation, is shown here on July 19, 2013. The installation encourages visitors to focus on sustainability.

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Size: 4628px × 3161px
Photo credit: © Susan Montgomery / Alamy / Afripics
License: Licensed
Model Released: No

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