T: What do you think of the lecture? 
S: You mean the one On Future Energy? 
T: That`s right. 
S: I think it was very interesting and helpful. 
T: Do you really? 
S: Yes. 
T: But I think some of his view points are not correct. 
S: Yes? 
T: Take the coal for instance. 
S: What about it? 
T: Coal won`t become important again. Everybody can see that. 
S: Why not?
T: For one thing, it`s too dirty. We won`t be able to find people to work down coal mines in the future. For another, the coal is limited. We have to develop new kinds of energy, such as atomic energy. 
S: We`ll invent new kinds of machinery to mine underground for us and nobody can tell exactly how much coal there is underground. Atomic energy can`t take the place of coal because it`s too dangerous to produce. Once leakage occurs, it`ll bring disastrous.
T: Nonsense. When atomic energy is used widely, we`ll certainly have more advanced and more strict preventive measures to prevent any kind of leakage. It`s safe and clean as well. 
S: Perhaps we can use coal, oil and atomic energy side by side.
T: Yes. The future is always hard to predict. It`s decided by many unexpected factors.
S: That`s right. Let`s hope for the best.