Rural territory has not to be considered as an empty space to anthropize, but as a system combined to the city, since it is the place where basic processes of primary production, of biodiversity safeguard and of landscapes take place. Urban Planning has proved unable to conceive open spaces also because of the seeming indifference of such places towards building uses typical of urban regulations. By isolating problems of intervention to business interests, in its turn, agricultural planning has been unable to do better. Evaluations on agricultural areas cannot exhaust themselves in the scope of a general rule of production use or of environmental protection, but the role of an agricultural space as a heritage of the metropolis has to be recognized. This role cannot be neither entrusted to the individual interests of the private independent farmer, nor can it be only linked to the regulating ability of economics. It must be set among the targets of the higher public interest pursued by the physical territorial planning also in its contemporary version of eco-planning. Contemporary Urban Planning should begin looking at modern agriculture as a reality to establish new strategic relations with, according to a non-deterministic approach for the evolution of the urban environment. The integration of agricultural areas in the urban scope is a subject of great interest with a view to change our cities in environmentally more liveable places. In the scope of the debate on sustainable development, one of the central topics is the issue of marginal territories, in particular, the redefinition of reciprocity relations between agricultural territories and cities, between environmental systems and urban systems. The city has excessively spread, leaving neighbouring protected and agricultural areas as a reserve for urban growth. The whole XXth century has been characterized by a clear separation between agriculture and city. Some recent experiences show how a possible rebalance of the urban ecosystem can take place through the hybridization of the two systems, whose planning is one of the challenges of environmental planning. Urban, technological, landscape and environmental aspects coexist in it. Hence, a culture of plan and of project, renovating its reference models facing the challenge of a liquid modernity, establishing new relations with a culture other than agriculture, that is not a building culture under traditional terms, but is productive under enzymatic terms, that follows bio-compatible logics and uses highly advanced support technologies.
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