Issue 37. Society should make efforts to save endangered species only if the potential extinction of those species is the result of human activities.
Write a response in which you discuss your views on the policy and explain your reasoning for the position you take. In developing and supporting your position, you should consider the possible consequences of implementing the policy and explain how these consequences shape your position.
求拍~
For a long timeas we know that human beings doesn't live alone on this planet, other features,whether live or "unlived", are also highly involved in our lives. Notonly because animals like pig, chicken, fish and vegetables afford us food tosurvive, they also act great invisible functions in our living. While thepopulation of human beings is expanding, the numbers of many species are reducingsharply or even down to extinction. Some shocking number contraction is from1600 to 1800, 25 species disappeared and 78 between 1800 and 1950, but now, 3per hour and 75 per day in the whole world; many species like blue-buck, Balitiger, elephant bird died out from a great quantities. Many reasons led tothose catastrophes, geologic factors such as earthquake, volcanic eruption, geomagneticvariation, environmental influences from climate change to habitat destruction,another vital factor is human activities.
Human beings are now considered to be the biggestreason why species extinct. According to Nature Magazine, a million specieswill disappear from the earth in 50 years, and due to human activities, theextinction speed has been 1000 times faster. Industrialization is definitelyconducive to people, offering us a more developed and convenient world to live,but to animals and plants may not be the situation. Railways and buildings cutthe forests down and so do many homes of animals, and those that avoiding fromhome destruction or hunting can't really survive since the gases discharged bycars, chemical factories are soon pervading in the air all over the world; theriver they used to drink are contaminated and species for food has been hunted byhuman or extinct already. Finally, they have no way to exit. Even thosegeologic and environmental reasons enumerated are partly caused by us directly orindirectly, earthquakes has been more frequently and some are accused ofhuman's activities like over-exploitation with hydraulic fracturing that will causethe rock-stratum crack, a reason of earthquake. Climate change like global warmresulting from carbon hydrates produced by human has led polar bears nowhere tolive, so potential extinction is the fate they are going to confront if no humanefforts are taken.
The statementsuggests that society should make efforts to save endangered species only ifhuman results in the extinction. Without thoroughly understanding theimportance of these species to human beings, the suggestion is not valuable.Charles Elton, an English zoologist, put up with his famous "foodchain" theory in 1927, which is still highly influencing the study ofmodern biology. Let's make it simple to understand, every organism including human,fungus and bacteria is bond to this chain with food necessities inevitably,once a knot in the chain is taken away and with no substitutes as food for theupper level organisms, the chain breaks and the upper level chain deteriorateone by one; if that happens on fungus, the decomposer of corruptions, theenergy circulation will be destroyed. Indeed, the model is simpler than theactual situation, which the biologic circulation is a food net: numerous foodchains are connected with overlapped prey, with higher level an organism is,the more food sources it can obtain and less on the other way around. Yes, extinctionof one species may not induce a chaos, but once accumulating to some degree, thenet will be fragmentary, so does human.
Food is only onebut the most important connection between human beings and other species, othersbenefits from species like medically, emotionally, aesthetically are also necessarilycontributed to our life. It is no exaggeration to say that we rely on theorganisms around us and absolutely impossible to survive alone, so no matter whatthe reason a species faces potential extinction, we need and have to makeefforts to save them, for the generation now and descendants of our own.
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发表于 2013-9-5 19:27:13
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