The reading passage states that several methods are proposed to use coal without harming the environment. However, the listening passage refutes this statement by providing a few opposing examples.
To begin with, the writer asserts that changing coal into a gaseous form will eradicate impurities from the coal. However, the speaker casts doubt this assertion by stating that gasification will engender the burning of fuel gas which will offset the advantages. Additionally, the current technology of gasification requires a lot of water supply so that the costs outweigh benefits.
Furthermore, the text maintains that static electricity will extrapolate pollutants produced by coal out of the air. On the other hand, the speaker rebuts this argument by stating that static electricity will only collect ash particles of the air which are minor components of air pollution.
Finally, the passage contends that tightly woven fabric filters will collect majority of waste from coal. On the contrary, the professor challenges this contention by stating that operating fabric filter will require extended maintenance to operate due to their short expectancy, which is about 36 months. Additionally, people should acquire a lot of financial demands in order to operate large fans of fabric filters, lowering overall efficiency.
In conclusion, while the passage argues that these efforts will eradicate the adverse effects of coal, the professor casts doubt on this argument by stating a few opposing examples.