Peter Sloterdijk uses this concept to explain that life is always a life in an environment, and therefore against the environment. “Starting from the beginning of the twentieth century, the totality of the circumstances that we can not give up bears in called environment.” The notion of environment has allowed to identify and disconnect materials, natural and cultural relations, processes until then perceived as a whole. It was an “accelleration of explicitation of life facts and of knowledge that leave their condition of background elements to become manifest operations”. Through the environmental discourse modernity takes the form of a process of explicitation for what once “rested” and “enveloped” the lives of individuals and local societies. As in a process of air conditioning we can describe the process of spatial construction (in general terms) in the Modern era as the search for a form of explicitation of the atmosphere. In first World War , for the first time are experimented environmental modification strategies similar to certain contemporary atmo-terrorism practices . We begin to realize that “the subject is not only what he eats or what he does but also where he immerses oneself “into the air as into cultural systems. One of the main issues addressed by the scientific thought of the twentieth century has been explicit as so to make the “air condition explicit” . Let’s see how this attention to the environmental dimension of living has produced design strategies for green spaces observing in particular four experiences. 1 Leberecht Migge’s gardens in Frankfurt. The garden as a social product. 2 Sigurd Lewerentz, Skogskyrkogården (Stockholm Cemetery). Ecology as cultural construction. 3 Carl Theodor Sorensen, Naerum Allotment Gardens. Ecology as individuality and freedom. + 4 Toyo Ito, Parque de la Gavia, Madrid (Other references might be: Joseph Beuys, the struggles of the U.S. Green Guerrillas during the Seventies and the Community Gardens experiences).