"Rewilding" is a concept that is catching on in cities around the world, as they wake up to the devastation caused by centuries of controlling and exploiting nature for human needs. Rewilding aims to restore an area to its original, uncultivated state, either through letting nature take over completely, or through landscaping and architectural design. While Singapore has its artificial "super trees" that are home to 158,000 plants, Nottingham in the UK is planning to convert an empty shopping center into an urban oasis of wetlands and wild flowers. China has a wetland in the center of the city at Harbin, and Ireland's Pollinator Plan has seen insect, bird and bee populations thrive. Sydney's vertical hanging gardens uses green walls and roofs, while cities in Germany are allowing wildlife to thrive in former parks and vacant plots. Densely populated New York is using walkways and former elevated railroads to provide a habitat for butterflies, bees and hundreds of plant species, and Barcelona has hundreds of hives, insect hotels and bird and bat nesting towers dispersed around the city.

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