GRE

Thinning of Ozone layer and species extinction

GRE Essay Topic 879 - 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. Discuss how well reasoned you find this argument.

Author: basma Hashmi-Saif | Date: March 18, 2018 | Score:5

The author is discussing the effects of thinning of ozone layer.He assumes that population of salamander species is declining and claims that the population of many other species will reduce too as a deleterious effect of thin ozone layer. Ozone layer is a protective layer surrounding Earth'...

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I disagree with the author's claim that pollution is the cause of population degradation in salamander and other species on planet Earth .
Firstly i would like to ask the author is Industrial pollution the only cause for reduction in ozone layer ?? There are many other factors which the author has not considered such as air conditioners, Refrigerators, vehicles all of these pollute the atmosphere with Chloro-Fluro-Carbons (CFC's) which in turn damages the ozone layer .

Secondly, there is no direct relation between the decrease in population of salamander species and the harmful ultra violet rays. May be it could be the reason but still there is no evidence or data provided thus weakening the claim. Also the author is not looking for the various other reasons that could possibly be the reason behind the population decrease in salamander species. Only the fact that lacking of protective shells might not be a sufficient reason for the decrease in the species population. As these species might have been vanished away due to other reasons, such as decreased water level in the lake due to natural calamities.

Furthermore, the author tries to make pollution the only cause that can contribute to the decrease in population of other species. This is completely flawed, as there are many reasons fora particular species to go extinct.A natural calamity can be the reason too , but the author lacks the vision of foreseeing other causes that can lead to decrease in population of species. The relation that author made among pollution, ozone layer depletion and population decrease is completely false and has been not supported by proper evidence, suitable examples.

To sum up , the above argument lacks evidence, has no proper connection between the mentioned quantities. Also the author has provided insufficient data for the claim he has put up.

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