Firstly, the author states that salvage logging could help the recovery by making room for fresh growth. However, the lecture opposes this claim by saying that the rotten wood could have provided nutrient to enrich the soil for new trees. So salvage logging actually fails to offer the right condition for growth.

　　Secondly, the passage claims that salvage logging can minimize the insect infestation by raising the example of SBB. However, the speaker views this issue from an opposite angle. According to her/him, SBB has lived in forest for a hundred years without causing major damage. Besides, the rotten trees not only provide habitats for harmful insects but other birds and species that benefit the forest.

　　Lastly, the writer argues that salvage logging could benefit the local economy. By contrast, in accordance with the professor, this view does not hold water. The reasons are twofold. On one hand, salvage logging entails expensive means of transportation such as helicopters. On the other hand, only outsiders with specific trainings and experience can handle the work. So there won't be any job vacancy for local residents.