Not only health and well-being, the presence in the cities of well-groomed and managed green areas also translates into greater safety. This was the reason for the conference "Green in Smart Cities, parks and avenues for the welfare of cities against degradation and crime", which Assofloro Lombardia and Coldiretti organized last October 15 in Milan.
This is the first time that the topic of the correlation between green and security is discussed in Italy, at the center of numerous studies in the USA.
During the conference, Francesco Ferrini, professor of the University of Florence, illustrated the results of the famous research in Philadelphia, where in 2014 some free lands in the city were reclaimed and returned to the community as parks and private gardens. "Result: the phenomena of crime had given way to a well-kept, protected and most importantly secure environment, with an important reduction in registered crimes".
The architect Stefano Boeri illustrated the proposal to use plants instead of concrete barriers to protect squares and open spaces from possible terrorist attacks. "An added value that on the one hand would improve the aesthetics of urban centers, on the other would allow citizens to contain the" said Boeri.
There have been many variations of the theme within the Milanese convention: green as a source of well-being, therapeutic gardens, models and ideas for virtuous management, the relationship between the public and private sectors, and mobility.
But how green is there in our city? "Today - says Nada Forbici, president of Assofloro Lombardia - 31 square meters of urban green per person is the average value for Italian cities, which is reduced to 22 square meters in Turin, 17.9 in Milan and 13.6 in Naples. It is not enough to break the siege of smog. The battle can be won, as well as through the reduction of pollutants, also by enhancing the urban green. The good planning and planning of urban green is the first rule for a long-term success against pollution. A rich biodiversity, using native, evergreen and deciduous trees, makes the fight against pollutants more effective ".
"An adult plant is capable of capturing 100 to 250 grams of fine dust from the air and one hectare of plants eliminates about 20 kilos of smog in a year - remarks Ettore Prandini, Coldiretti's national vice president and President of Coldiretti Lombardia - La urban vegetation can bring down up to 3% of CO2 emitted from car traffic. The trees can reduce the temperature of the environment from one to three degrees Celsius, resulting in energy savings for cooling and heating buildings up to 30-40% quantifiable in an average economic value of € 18 per tree per year. And again, urban vegetation removes from the atmosphere up to 161 kg per year of PM10, with an estimated economic benefit of about € 5500. Evergreens have the ability to retain polluting agents even in winter, while the deciduous trees continue to use the trunk and the branches. Important actions must be to insert trees in school playgrounds and in particularly busy city areas to mitigate the air. The use of green and green vertical terraces in buildings can also contribute to improving the quality of the urban climate ".