![[Trees in a park surrounded by a big city.]](/forests/art/modify.jpg)
Trees help cool the "heat island" effect in our inner cities. These islands result from storage of thermal
energy in concrete, steel and asphalt. Heat islands are 3 to 10 degrees warmer than the surrounding
countryside. The collective effect of a large area of transpiring trees (evaporating water) reduces the air
temperature in these areas.
Trees also:
- Lower air temperature through shade.
- Increase humidity in dry climates through evaporation of moisture.
- Reduce glare on sunny days.
- Reduce wind speed.
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