本作业是一篇美国的环境与经济可持续发展方面的论文代写：巴西森林采伐和环境破坏问题，近年来对世界威胁最大的问题之一是——周边环境的破坏，巴西国家的森林砍伐问题已成为全球森林砍伐的重大问题。

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　　近年来对世界威胁最大的问题之一是——周边环境的破坏，巴西热带雨林被破坏，是当时国家比较注重的一个问题，因为它的形成导致了一些生态问题的出现，例如我们正面临的全球变暖、臭氧层破坏以及全球气候多变现象。巴西国家的森林砍伐问题已成为全球森林砍伐的重大问题。

　　据专家透露，在几年前全球土地的森林覆盖率达到了14%，如今只剩下6%；这一数据引起了有关部门和人员的重视，此外找到了该国剩余的30%森林土地(Rain-tree)。过渡森林砍伐带来的结果是非常的严重，因为全球人类呼吸所释放的二氧化碳需经过树木的一个光合作用过程，将其转变为氧气。有关专家称地球上20%的氧气都是由巴西的热带雨林释放而出的。据相关部门统计，世界上90%的动物和植物都生存在巴西的热带雨林中，所以森林被破坏，动物和植物的灭绝又是一个岌岌可危的问题。(Rain-tree)

　　In recent years one of the biggest threats the world as a whole faces is the destruction of our environment.The destruction of the Brazilian rainforest is probably the most important issue that should be taken into consideration because it is the cause of other major ecological problems we are facing such as:global warming,the depletion of our ozone layer,and noticeable climate changes around the world.Brazil's deforestation problem has turned into earth's deforestation problem.

　　Experts say that not too long ago 14%of the earth was covered with rainforests.Today only 6%remains and everybody focuses their attention on Brazil because 30%of the remaining rainforests are found in that country(Rain-tree).Deforestation is so dangerous because much of the carbon dioxide that all countries produce is turned into oxygen in the rainforest through the process of photosynthesis.Experts say that 20%of the earth's oxygen is produced in the Brazilian rainforest.It is estimated that 90%of all animal and plant species live in the Brazilian rainforest so extinction is another major issue(Rain-tree).The money that deforestation brings to the Brazilian government is a huge motivator since it is a developing country.

　　There are several ways and reasons for which rainforests are destroyed.The major cause of deforestation is logging.The forest is most valuable for its timber so its preservation would cost a lot of money.Commercial loggers destroy huge parts of the forest to reach the trees they want.Trees are brought down and along with them their vines and lianas,which are connected to other trees.When these come down,along come large canopies of green formed above the ground by these vines and lianas.The removal of the trunks cause extra damage since they are carelessly pulled out of the rainforest,destroying and damaging anything in their path.The large machinery compacts the fragile soil with their large tracts,making it very difficult to regenerate.Noise pollution and the destruction of the zone frighten animals living in the area,making them flee to other parts.Commercial loggers make roads to reach other parts of the forest easier.A road connecting point A to point B will disrupt plant and animal life anywhere near it.The roads are then used continuously and animals are forced elsewhere.

　　What most hurts the forest about logging is local people without land that build their homes next to these roads,they are called‘shifted cultivators'(Hect 115).

　　Shifted cultivators usually result when peasant's land is‘stolen'by the government because large corporations or companies unjustfully buy the land.These‘land less'people then build their homes inside the rainforest and plant food in order to survive.The Brazilian government blames these people for 60%of the deforestation(Hect 210).In Brazil over 40%of land that is good for cultivating is owned by only 1%of the population(212).

　　Another major cause of the deforestation problem is agriculture.When areas of rainforest are destroyed,ranchers or crop growers move in and clear the entire area.