Two experimental ‘eco-skyscrapers’ known as the Bosco Verticale towers are being constructed in Milan and will house at least as many trees as people. As more than 50% of the world’s population now lives in cities, urban planners are tasked with designing buildings that make space for Nature, and the ‘vertical forests’ of Milan are setting a precedent. Each tower provides around one hectare of woodland over 27 floors, incorporating over 700 trees, 5,000 shrubs and 11,000 plants. Surprisingly, creating this urban biodiversity only adds 5% extra to construction costs. The plants produce oxygen, ...


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