We invite you to know CAMBIUM a project that offers the city of Madrid the opportunity of a forest, a forest in all its complexity in which the city is at its service. Through this proposal, the city changes its DNA. CAMBIUM appears as a proposal that obtained the second position in AREA 02 of the International Competition for the Metropolitan Forest of Madrid, but at the same time, it is offered as a forceful strategy to be developed in this and other cities. CAMBIUM is a collaboration of PSAAP as landscape designers within a wonderful multidisciplinary team.