GRE作文北美范文:關(guān)于瀕危物種的存在

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　　"At various times in the geological past, many species have become extinct as a result of natural, rather than human, processes. Thus, there is no justification for society to make extraordinary efforts, especially at a great cost in money and jobs, to save endangered species."

　　What are the limits of our duty to save endangered species from extinction? The statement raises a variety of issues about morality, conscience, self-preservation, and economics. On balance, however, I fundamentally agree with the notion that humans need not make "extraordinary" efforts--at the expense of money and jobs--to ensure the preservation of any endangered species.

　　As I see it, there are three fundamental arguments for imposing on ourselves at least some responsibility to preserve endangered species. The first has to do culpability. According to this argument, to the extent that endangerment is the result of anthropogenic events such as dear-cutting of forests or polluting of lakes and streams, we humans have a duty to take affirmative measures to protect the species whose survival we've placed in jeopardy.

　　The second argument has to do with capability. This argument disregards the extent to which we humans might have contributed to the endangerment of a species. Instead, the argument goes, if we are aware of the danger, know what steps are needed to prevent extinction, and can take those steps, then we are morally obligated to help prevent extinction. This argument would place a very high affirmative duty on humans to protect endangered species.

　　The third argument is an appeal to self-preservation. The animal kingdom is an intricate matrix of interdependent relationships, in which each species depends on many others for its survival. Severing certain relationships, such as that between a predator and its natural prey, can set into motion a series of extinctions that ultimately might endanger our own survival as a species. While this claim might sound far-fetched to some, environmental experts assure us that in the long run it is very real possibility.

　　On the other hand are two compelling arguments against placing a duty on humans to protect endangered species. The first is essentially the Darwinian argument that extinction results from the inexorable process of so-called “natural selection” in which stronger species survive while weaker ones do not. Moreover, we humans are not exempt from the process. Accordingly, if we see fit to eradicate other species in order to facilitate our survival, then so be it. We are only behaving as animal must, Darwin would no doubt assert.

　　The second argument, and the one that I find most compelling, is an appeal to logic over emotion. It is a scientific fact that thousands of animal species become extinct every year. Many such extinctions are due to natural forces, while others are due to anthropogenic factors. In any event, it is far beyond our ability to save them all. By what standard, then, should we decide which species are worth saving and which ones are not? In my observation, we tend to favor animals with human-like physical characteristics and behaviors. This preference is understandable; after all, dolphins are far more endearing than bugs. But there is no logical justification for such a standard. Accordingly, what makes more sense is to decide based on our own economic self-interest. In other words, the more money and jobs it would cost to save a certain species, the lower priority we should place on doing do.

　　In sum, the issue of endangered-species protection is a complex one, requiring subjective judgments about moral duty and the comparative value of various life forms. Thus, there are no easy or certain answers. Yet it is for this very reason I agree that economic self-interest should take precedence over vague notions about moral duty when it comes to saving endangered species. In the final analysis, at a point when it becomes critical for our own survival as a species to save certain others, then we humans will do so if we are fit - in accordance with Darwin’s observed process of natural selection.