Stefano Boeri, the Milan-based architect and urban planner, presents his extraordinary model for sustainable residential buildings. First realised in Milan in 2014, Boeris project for metropolitan reforestation intends to regenerate the environment and urban biodiversity without expanding the city. In short, the vertical forest is a model of vertical densification of nature within the city, both a thriving ecosystem and an ever-changing urban landmark. This book offers an in-depth exploration of the concept, its feasibility, functionality, and future possibilities. Also featured is an illustrated dictionary of the vertical forest, with scientific details on its diverse flora and fauna.