The passage argues that planting genetically modified trees can mostly bring profits to people. But in the lecture, the professor has a completely different view as she thought planting those trees may lead to problems and are costly. 

Firstly, the passage suggests that the genetically modified trees are designed for easier survival than normal trees. However, the lecture points out that they are only resistant to one single condition and cannot ensure the survival of those trees. This is because the genes of the genetically modified trees are comparatively more uniform, and when there is a climate change and it is not suitable for their survival, they will all die with no except. 

Secondly, the passage points out that the genetically modified trees are more likely to bring economic benefits to the ones who grow those trees. Conversely, the lecture suggests that it actually has hidden  costs for growing those trees as the farmers have to pay fees to the companies who own the seeds. Thus, they have to pay much more than only paying the cost of planting those trees.

Finally, the passage claims that the genetically modified trees can lower the possibility of the overexploitation of wild trees. The lecture refutes the idea completely because those are said to be damaging the local wild trees. This is because the genetically modified trees also grow among the natural trees, which they will compete for resources and leads to serious damage of wild trees.