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People walk through the Tree Library park in Milan, Italy, Sunday, December 9, 2018. If Italy's fashion capital has a predominant color, it is gray not only because of the blocks of uninterrupted neoclassical stone buildings for which the city is celebrated, but also due to the often-gray sky that traps in pollution. The city has ambitious plans to plant 3 million new trees by 2030_ a move that experts say could offer relief to the city’s muggy and sometimes tropical weather. (Photo by Luca Bruno/AP Photo)
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