In fact trees and planting of various kinds can beused to make city streets actually less dangerous inparticular areas.
How do trees do all that, you ask?
Well, the main difference between a tree and abuilding is a tree has got an internal mechanismto keep the temperature regulated.
It evaporates water through its leaves and thatmeans that the temperature of the leaves is neververy far from our own body temperature.
The temperature of a building surface on a hotsunny day can easily be twenty degrees more thanour temperature.
Trees, on the other hand, remain cooler than buildings because they sweat.
This means that they can humidify the air and cool it - a property which can be exploited toimprove the local climate.