Cities are deserts of biodiversity
Buildings should not be ecological "obstacles". Instead, in densely built-up areas roofs and facades should represent vital spaces for plants and animals. A recent study conducted on green roofs in Basilea and London shows that substrate density and water are essential factors to maintain the flora and fauna diversity. A study conducted on 11 green roofs in Basilea revealed 172 different species of beetles, 60 spiders, and 25 bird species. This is an example of the importance of green roofs and vertical gardens as spaces to support biodiversity in the cities. Picture by Chuttershap.