In the lecture, the professor consents the idea in the reading passage that salvage logging may help the forest recover from natural disasters such as fires and storms. However, the professor claims that it may result in negative consequences in the long run.
First, the professor claims that cleaning up dead trees does not necessarily create the right conditions for new trees to grow. Though taking up some space, decomposition of dead trees can make the soil more suitable for the growing of new trees, and thus benefits the forest in the long term. However, removal of dead trees might make the soil lack some essential nutrition.
Second, the professor continues challenging the point in the reading passage concerning the insects. He says that having existed for more than 100 years, these insects have caused no major harm. Moreover, dead trees are habitats not only for harmful insects, but also for other animals such as birds. Therefore, the presence of dead trees can make the whole forest healthier in the long-term.
The last advantage of salvage logging stated in the reading passage is about economic benefits. Nevertheless, the professor in the lecture regards it as questionable, because the benefits brought by the use of damaged trees are small and short-term while the costs are huge due to the need of expensive instruments such as helicopters. Also, the additional jobs created actually have little benefits on local residents, as they are usually taken by more trained and experienced workers from other provinces.