【big fish】3月19日Argument207-by jjooyy

jjooyyUID: 2704028

TOPIC: ARGUMENT207 - It is known that in recent years, industrial pollution has caused the Earth's ozone layer to thin, allowing an increase in the amount of ultraviolet radiation that reaches the Earth's surface. At the same time, scientists have discovered, the population of a species of salamander that lays its eggs in mountain lakes has declined. Since ultraviolet radiation is known to be damaging to delicate tissues and since salamander eggs have no protective shells, it must be the case that the increase in ultraviolet radiation has damaged many salamander eggs and prevented them from hatching. This process will no doubt cause population declines in other species, just as it has in the salamander species.
WORDS: 295          TIME: 00:30:00          DATE: 2010/3/19 20:41:06

The author makes a linkage between an increase of ultraviolet radiation and a decline of a species of salamander, concluding the population of other species would decline likewise. It looks a bit ridiculous after second consideration.

To begin with, the increase of ultraviolet radiation is lack of evidence. Although the Earth's ozone layer is thinner than before, it can still hold ultraviolet radiation. As the author fails to mention how thin the ozone layer currently are, it is presumably that ozone layer is still thick enough to cover the Earth and to prevent the ultraviolet radiation from reaching the Earth.

In addition, the population of salamander species may not caused by the ultraviolet radiation. Does salamander have no other protective mechanism? Could ultraviolet radiation damage the tissues of salamander? Since no clear evidence is presented, the correlation of these two remain to be seen. In all likelihood, the decline of population could be the result of deforestation, the outbreak of prayers and the terrible condition of weather.

Finally, even assuming ultraviolet radiation has caused salamander species decreased, the arguer also makes a false analog between the population of the salamander species and the population of other species. The conditions of salamander species and other species are not exactly same. Other species in nature tend to have their own protective ways, such as shells, fur, horns and so forth. Through these means, they have more possibilities to survive than to die out. Therefore, the population of other species still would not decrease significantly.

In conclusion, the amount of ultraviolet radiation may not significantly increase, and it might also not cause the decline of salamander species, nor about the decline of other species. To prove the writer is right, we need more evidence to support the conclusion.

topranUID: 2310216

1# jjooyy


The author makes a linkage between an increase of ultraviolet radiation and a decline of a species of salamander, concluding the population of other species would decline likewise. It looks a bit ridiculous after second consideration.

To begin with, the increase of ultraviolet radiation is lack of evidence. Although the Earth's ozone layer is thinner than before, it can still hold ultraviolet radiation. As the author fails to mention how thin the ozone layer currently are, it is presumably that ozone layer is still thick enough to cover the Earth and to prevent the ultraviolet radiation from reaching the Earth.
(我咋觉得这个不能驳呢)

In addition, the population of salamander species may not caused by the ultraviolet radiation. Does salamander have no other protective mechanism? Could ultraviolet radiation damage the tissues of salamander? Since no clear evidence is presented, the correlation of these two remain to be seen. In all likelihood, the decline of population could be the result of deforestation, the outbreak of prayers and the terrible condition of weather.

Finally, even assuming ultraviolet radiation has caused salamander species decreased, the arguer also makes a false analog between the population of the salamander species and the population of other species. The conditions of salamander species and other species are not exactly same. Other species in nature tend to have their own protective ways, such as shells, fur, horns and so forth. Through these means, they have more possibilities to survive than to die out. Therefore, the population of other species still would not decrease significantly.

In conclusion, the amount of ultraviolet radiation may not significantly increase, and it might also not cause the decline of salamander species, nor about the decline of other species. To prove the writer is right, we need more evidence to support the conclusion.
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