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In London, beavers have been reintroduced after 400 years. In the Dutch city of Utrecht, the roofs of bus stops are now planted with moss to help support bees. In Delhi, India, multiple biodiversity parks are restoring small tropical forests within the city, home to wild boar, deer, and even leopards. In Haikou, China, a polluted river was freed from a concrete channel and the banks were replanted with mangroves and constructed wetlands.
Urban rewilding—reintegrating nature into cities—is growing quickly. At a time when more than a million species are on the brink of extinction, both because of habitat loss and climate change, adding greenery in cities obviously can’t solve the biodiversity challenge on its own. But inserting nature in concrete spaces can help, especially if cities plan broader green corridors that help wildlife move. And it can also help cities adapt to extreme heat and other climate impacts like flooding.