In a neighborhood of right-angled stone, stucco and brick buildings not far from Milan’s central train station, two thin towers stand out. Green and shaggy-edged, they look like they’re made of trees. In fact, they’re merely covered in trees — hundreds of them, growing up from the towers’ staggered balconies, along with 11,000 perennial and covering plants, and roughly 5,000 shrubs.
The greenery-festooned towers, called the Bosco Verticale, or Vertical Forest, are residential buildings in a broader-than-usual sense. The 18- and 26-story structures are “a home for trees that also houses humans and birds,” according to the website of architect Stefano Boeri, who has built tree-covered buildings elsewhere and is working on similar projects in Antwerp, Belgium, and Eindhoven in the Netherlands.
The Bosco Verticale is an example of urban rewilding, the growing global trend of introducing nature back into cities. There are consequences to the pace of today’s urban growth, which is the fastest in human history, including loss of biodiversity, urban heat islands, climate vulnerability, and human psychological changes. The U.S. Forest Service estimates that some 6,000 acres of open, undeveloped space become developed each day. Globally, past urban planning decisions like the prioritization of the car have given rise to cities that, but for scattered parks, tend to be divorced from nature. Rewilding aims to make cities better and more sustainable for people, plants, and animals.