At this fourth appointment of the cycle Three Cities in Flux held at the Accademia Britannica and curated by Marina Engel, the focus shifts from London to Milan, with the lecture and exhibition by Stefano Boeri BioMilano, offering a series of reflections, research and projects for the city of Milan, to imagine new vital hybrids of three environmental spheres: urban, rural, natural. The exhibition is composed of two main parts. The first, set in the year 2030, presents BioMilano: six projects for the city, imagining the city of Milan as a great laboratory of sustainable environmental transformations. The second analyzes the individual projects in detail and the research work behind each proposal, with models and drawings.