What can we do?
Cool paving Roads are covered over with a (off-)white layer to reflect the sun rays. Other benefits: less degradation of the asphalt when it blocks ultraviolet, water and reduced oxidation. Roads will last longer and repairs are better protected (good news for the Rome based association called "Tappini").
Cool cars and bikes Cars painted white or another bright color that reflect more of the suns heat. The airco has less to cool, they are better visible in the dark and therefore safer. Another point: burning a liter of fuel produces heat, harmful pollutants and over a kilogram of water vapor. For a big city like Rome that's a lot of extra humidity. So the logical next step is electric vehicles (EV): cars, scooters and bikes. The Ferrari 512S Modulo design is a good starting point for it has single curved panels that could be equipped with solar cells.
Cool roofs We can paint roofs and walls (off-)white but for historical cities like Rome there has to be a more acceptable solution. We can slowly fase out the darker - heat absorbing - tiles together with a novel idea presented in the next section.
Plants, trees and water also help to cool a city.