▶ Your Answer : Both of the author of the reading passage and the lecturer are talking about the possibility of reducing deleterious impact of coal on the environment. The author asserts that coal can become enviromentally friendly energy souce, whereas the lecturer casts doubt on this assertion for three reasons. First of all, the lecturer claims that coverting coal into syngas is not a good solution. This is because the converting process involves using fossil fuel, which is detrimental for the environmental as coal is. Moreover, removing impurities requires huge amount of water as well. This counters the author's claim that gasification is a promising development. Next, the speaker maintains that using a form of static electricity is no better. Although ashes are collected by using the static electricity techonology, ashes are the minor problem. The thing is, carbon dioxide, which is the major causes for pollution, is not collected. This contradicts the author's argument that using a form of static electricity can prevent air pollution. The final statement of the lecturer is that using fabric filter is not cost effective in the long term. This is because the machine requires too much maintenance and it needs replacement about every six months. Furthermore, operating fan requires a lot of energy casting doubt on the machine's efficiency. This refutes the author's assertion that fabric filters are one more solution for reducing coal's impact.
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