Trees have a cooling effect on the environment. This is due to evaporation as well as the shade that they provide. Trees also reduce the effects of pollution on the environment.
Trees are not only the largest living organisms but are also among the longest-living; the lifetime of a tree typically ranges between 50 years and 300 years, although this is dependent on the species of the tree and the region it is planted in. Some trees, however, live even longer than this. An example is the live oak tree, which lives for over 500 years. Giant sequoia trees can live for up to 2,500 years. Trees growing in natural wooded environments typically live longer than trees growing in city conditions.
Of the 0.1 percent of solar energy trapped by living organisms, trees account for 50 percent of all this energy. This makes them the organisms responsible for trapping most of the sun's energy. Trees increase the amount of water in the atmosphere; on an average daily basis, a large tree lifts up to 100 gallons of water out of the ground and releases it into the air. Trees also increase the amount of oxygen in the atmosphere; in one day, a large tree produces enough oxygen for four people.