Topic：Has human harmed the Earth?
Some people believe that the Earth is being harmed (damaged) by human activity. Others feel that human activity makes the Earth a better place to live. What is your opinion? Use specific reasons and examples to support your answer.
参考分析：
不要急于选择。两种观点都过于含混。Human activity指的是什么？
饮食起居：广东人把某种海豚(dolphin)吃得almost extinct；美国人养宠物鹦鹉(parrot)，导致南美洲很多稀有品种(rare species)濒临灭绝。
科学研究：好的例子很多，比如电的发明。不好的也很多，克隆(clone)技术、基因重组(gene engineering)技术，可能导致道德(moral value)的沦丧(deteriorated; ruined);诺贝尔的发明(炸药explosive)究竟杀了多少人？塑料袋(plastic bags)的发明，导致了多少white pollution?
战争：从来都是灾难。生化武器，比如炭疽病毒(anthrax)。
结论：人类的行为对地球的影响，有好的，也有坏的，很难说哪一种更多。
不同意人们的活动将世界变成了一个更好的地方：
（1）地球的自然资源消失的很快；
（2）环境污染问题；
（3）人类发动战争，人口、古迹、土地都受到了损失。
People have learned how to turn wild natural areas to farmland, how to exploit minerals to adapt their needs, how to build roads and houses to expand their territories. People continuously improve their knowledge and develop technologies to improve their lives. It is undeniable that these activities of human beings make their lives better than ever before. Nevertheless, those activities also cause side-effects to the Earth because of pollution, deforestation, and exaggerated natural resource exploitation.
Nowadays, pollution becomes one of the most concerned problems. Because of the increasingly expanded factories, the industrialized areas, the burning of population etc, too much pollutant spills out everyday. Consequently, all of these things cause bad effect to the Earth. The purity of atmosphere is reduced seriously, the Earth is continuously warmed up, and ozone layer is holed.
Additionally, forest is asking for help in desperation. For last few decades, the forest areas have been reduced to 50 percent because of human deforestation. Green forestland of the Earth can be compared to the lungs of human. How healthy you are if your lungs are trespassed. I am sure that you will get more difficult with aspiration; as a result, your health will be affect badly. From this example, we can infer that how serious problem our Earth has to face with. I wonder how long it can endure.
Researchers show that the natural means is limited, but today, they are exploited so increasingly to adapt infinite human needs that someday, all mineral can be ended up. Because of serious pollution, alarming deforestation and progressive mineral exploitation, the ecosystem becomes unbalance. Consequently a lot natural calamities happen each year such as flood, hurricanes. A lot wild living creatures are exposed to narrow place of shelter and lacking foods. For these reasons, the Earth will become unhealthy.
In conclusion, the human beings harm the Earth. Human beings as well as their dear planet, the Earth, have been badly suffered by what caused by humans themselves. I hope that humans are soon aware of those problems so that they can have suitable policies in order to not only improve their lives but also keep and maintain the Earth fresh and green.
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