The role of new types of urban green for the environmental regeneration of the contemporary city

Contemporary cities are always more overheated for the anthropogenic effect linked to the general process of warming of the climate, but also because of their conformation, of vehicular traffic, of mineralized materials, and - in particular - of the decrease of the relation between built heritage and vegetable biomass. Instead the cities which have maintained large green surfaces inside them, have pleasing environmental conditions, because the vegetation, as well as improving the climate, filters out pollution, absorbs noise, increases biodiversity and contributes to many recreational, cultural and educational activities. Since the seventies, the green systems are starting to be seen as focal centers of the environmental regeneration of the city, both in the recovery of built heritage that in new buildings. In the last thirty years the structural integration of the green with the building envelope was a new challenge - even technological - for the project, which is outlined with green walls solutions, "green skin", vertical green, green roofs, etc. The paper aims to illustrate the new urban green types, designed as a microclimate control tool of urban areas, in order to improve the conditions of environmental and psychological wellbeing, especially in high-density residential areas and also to highlight the critical issues of a project culture which is not always able to fully control the new technological solutions of detail.