Trees are planted for a variety of reasons. Some people plant a few trees in their home to provide shade and for aesthetics. Everyone recognises that where there are trees the air is cooler and fresher than where they are absent. This is because trees absorb carbon dioxide from the atmosphere and their branches and leaves provide a shade that cools the air beneath them.
The older the tree, the larger it is, the more carbon dioxide it holds, the better the environment around it. The sense you get when you walk into an old forest or even a home with old trees is because of age of the trees. But there are many routes to improving quality of life and some people plant trees for money. The aim is to grow trees for a certain period of time and then harvest them.
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