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181201-99-42165_dpai ©Annette Reuther/DPA/MAXPPP ; 26 November 2018, Italy, Mailand: The "Bosco Verticale" (vertical forest) by the Milanese architect Stefano Boeri. Plants provide shade and form oxygen. Two to three degrees difference is measured between green and built-up area. (to dpa "When trees grow on houses and cities become edible" from 01.12.2018) Photo: Annette Reuther/dpa