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A picture taken on July 24, 2015 shows a view of the Bosco Verticale towers (Vertical Forest) in the Porta Nuova area in Milan. AFP PHOTO / GIUSEPPE CACACE (Photo credit should read GIUSEPPE CACACE/AFP/Getty Images)

A picture taken on July 24, 2015 shows a view of the Bosco Verticale towers (Vertical Forest) in the Porta Nuova area in Milan. AFP PHOTO / GIUSEPPE CACACE        (Photo credit should read GIUSEPPE CACACE/AFP/Getty Images)