작성일 : 16-07-29 10:52
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류형진 (61.♡.149.228)
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In the given set of materials, the reading passage and the lecture deal with coal to debate whether its usage is detrimental to humanity or not. The reading passage is providing three pieces of evidence to prove its point, whereas the lecturer argues against it by providing three compelling rebuttals.
First and foremost, the professor points out that coal has low energy efficiency compared to that of other fossil fuels. Since it has only 10 percent of energy efficiency, coal is not sufficient for growing population. As more energy is needed from growing population, it is better to use other natural gases even though they are more expensive. This challenges the reading passage's claim that coal has a plenty of reserves and, thus, is less expensive than the other natural gases.
Moreover, the speaker argues that using coal pollutes the environment, especially the water system. When using the coal, coal must be washed away with a toxic chemical. During this process, coal sludge is formed and this must be properly disposed. However, this is simply injected to the underground mines. This endangers both the underground and the surface water. The speaker's claim casts doubt on the reading passage's point that people are knowledgeable about coal usages, especially in producing electricity.
Last but not least, the lecturer asserts that using coal cause air pollution. It emits carbon monoxide which is harmful to humans. This gas causes problems in people's central nervous systems and hearts. It also has severe effects on fetuses. This is because the technology is yet well developed to prevent the leakage of coal plants. This idea contradicts the claim made in the reading saying coal can be utilized in various fields.
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