Stefano Boeri's Vertical Forests are an architectural innovation that transforms buildings into true vertical ecosystems by covering their facades with carefully selected vegetation that can withstand urban conditions and provide habitat for animals. They offer ecological benefits by absorbing CO2 and producing oxygen, reducing greenhouse gas emissions, and improving air quality. Socially, they provide green spaces and nature in the heart of dense urban areas, contributing to the health and well-being of city dwellers, and creating habitat for many species of birds and insects, thus contributing to urban biodiversity. The Bosco Verticale in Milan, Italy, is an iconic example of Stefano Boeri's Vertical Forests, with over 20,000 plants representing more than 700 trees and shrubs of different species, absorbing over 30 tons of CO2 per year and producing about 19 tons of oxygen.