Mrs. Michelle Graf
It is obvious the importance of the forest vegetation to everyone in the society. However, people in the past ages did a kind of thing that they thought was very meaningful—cutting down the trees. When they recall this history, most of them cannot be restrained from their remorse and guilty to it. Trees or forest are things that not only protect the environment but also help people to live better. Destroy of forest and deforestation brings a great many of harm to the environments as well as people in the world. It is believed that forest is significantly important to both the environment and people’s life. The importance of forest can be classified into the following five aspects. Firstly, it has climate change. Without forest, there will be more water vapor from the earth, which causes the imbalance of the surface heat and the distribution of the troposphere internal changes. The result of it is the deterioration of climate, such as reduced rainfall and increased sand. Secondly, without forest the emission of carbon dioxide will increase. Forest has an important influence on adjusting the amount of carbon dioxide in the atmosphere. The deforestation reduces the ability of forest to absorb carbon dioxide (Kummer 1992). Thirdly, aggravate soil and water erosion. Massive deforestation usually causes many natural disasters such as serious soil and water erosion, intensifies land desertification, landslide and debris flow. Fourthly, species extinction and biodiversity decrease. Forest ecological system is one of areas where there are the most abundant species. Fifthly, reduce water source and accelerate flood disaster. Deforestation has basically destroyed the ability of the earth to contain water, which results in the large areas of flooding (Margulis 2004). The definition to deforestation can be very complicated and vague. Many experts and scientists have tried hard to solve this problem. Houghton once gave a definition to deforestation as the gradual transformation of a main forest land or a secondary forest land (Houghton 1995). A more acceptable definition of deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a non-forest use. Examples of deforestation content conversion of forestland to farms, ranches, or urban use. For thousands of years, citizens in the Amazon in southern America have lived on farming by reclaiming land, the influence of which was not so profound until 20th century. Cutting down trees by using modern machines accelerates the speed and broadens the scale of deforestation. But this kind of deforestation brings a large amount of problems that people who conduct it have to face. Since the trees are things that have the capability to absorb carbon dioxide and release oxygen, deforestation means to increase the amount of carbon dioxide in the atmosphere. This is one of the reasons for the global warming, the main cause of which accepted all around the world is mainly because of the excessive emissions of greenhouse gas (Schneider&Ganopolski 2006). It will have significant influence on world climate and all of the people in the world ultimately. Forest takes up most of the ecosystem on the land, which is an important circle of the biosphere all around the globe (Amelung&Markus 1992). It plays as the gene pool, carbon reservoir, water reservoir and energy library, and a vital role to the balance of the ecosystem on the globe, which is the resource and environment in which the human beings are relied to survive and develop. There are various types of forests in the world, and the present forest has experienced a long and slow evolvement for its formation and development. However, the deforestation all over the world has done a lot of harm to the environment. Experts pointed out that there are about 17% of natural vegetation are destroyed...