Trees  are essential to our world and offer a wide range of benefits to our environment. The list of benefits that Trees provide is so long that one might believe its exaggeration, but it is not. Reduced pollution, erosion control, wildlife habitat, energy saving & enhanced human comfort are all well known long term consequences of Tree Planting. Planting Trees is one of the cheapest and most effective ways to bring about widespread improvement in the environment & the quality of life of an area. Even in the areas with over concreted land & water shortage of a mega polis like Delhi, plants & Trees play a huge rate n regulating temperature and air quality.
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Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a weather-sheltered ecosystem in and under their foliage. Trees also play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a building material, as well as a primary energy source in many developing countries. Trees also play a role in many of the world's mythologies (see trees in mythology). 
They give oxygen. People destroy them for wood and paper.
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