The theme is known, the scientific evidence continues. Let's talk about climate change.
In the regional capitals in Italy, the average annual temperature, equal to 15.8 degrees, is increasing by more than one degree (1.2) compared to the period 1971-2000. Also, extremes of heat are growing : +15 on summer days and +18 on tropical nights. The data was collected by Istat and included in the report "Climate change: statistical measures - Year 2020".
In all cities the average temperature anomalies are due to rises. Rome marks a +2 degrees. In 2020, nights were increasingly tropical. Among the 24 cities observed, summer days (with maximum temperature higher than 25 degrees) are 112 on average, while tropical nights rise to 56 (with temperature that does not fall below 20 degrees), always compared to 1971-2000 climate values. Rome is in third place, with an increase on summer days (+27). Tropical nights reach +53 in Naples, followed by Milan (+34 nights), Catanzaro (+33) and Palermo (+27).
2020 is the least rainy year over the last ten, together with 2011. The decrease in rainfall affects 22 cities.
A fact to be noted, in the three largest cities air pollution is slightly improving, but Milan is penalized because of the scarce presence of green areas, Rome has the highest rate of motorization and Naples the oldest circulating vehicle fleet.
At the same time, the interventions of urban forestation (increasing green areas in the city), useful for mitigation, i.e. to reduce the effects of climate change, are increasingly widespread. These interventions are present in 47 capitals, for a total area of 11.6 million square meters. Rome and Naples enjoy large parks and especially protected natural areas. Rome has an overall coverage of green areas equal to 35.8% of the municipal territory, composed only for 3.6% by urban green areas (over 46 million square meters) and 32.2% by protected natural areas (415 million square meters).