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Environmentalists call the lack of exposure to green spaces for urban-dwellers as "nature deficit disorder". But there is an ambitious proposal underway to connect Londoners to green spaces, by turning the city into a national park. The man at the heart of the idea is geographer Dan Raven-Ellison, who spoke to Dan Damon on the rooftop of the ÃÛÑ¿´«Ã½ building in central London. (Picture: Aerial view of London, showing large green spaces Credit: Octopi London)