In general, trees are viewed as admired symbolic individuals, producing recreational,
spiritual and emotional rejuvenation. Their lifespan can far exceed
that of humans. Planting a tree is a singular act of faith in the future, creating
a legacy for the community members who will follow. The presence of
trees in an urban area has been a reality for several centuries. Beautiful trees
in urban plazas are synonymous with a high sense of community and civic
pride. Trees significantly enhance the landscaping and appearance of the built
environment.
City trees improve several architectural and engineering functions, providing
a green infrastructure for communities. Trees create a friendlier environment
for walking, riding bikes and working, by reducing glare and softening
harsh traffic sounds and concrete views. Trees enhance the viewing in urban
areas of a variety of birds and small animals, such as squirrels. They are of
extreme importance to the functioning of many different ecosystems. Trees
planted in the right place around buildings can improve air conditioning and
heating costs by providing shade or by affecting wind speed or direction. Evergreen
trees with dense, persistent needles can be used to provide a windbreak,
while deciduous trees allow the sun to warma house in winter. The more compact
the branches and foliage of a group of trees, the greater their influence as
a windbreak. It has been shown that trees are able to remove pollutants from
the air; and they are seen as an important potential resource for removing
greenhouse gasses from the atmosphere. Trees contribute to the protection of
the environment and public health, providing economic and social benefits,
encouraging positive social interaction.