The speaker discusses that the problem caused by the wind farms can be solved through several solutions. This casts doubt on the reading passage's claim that wind farms play a negative roles that make them unfavorable choice.
To begin with, the speaker indicated that the number of birds and bats killed by wind farms is not as big as the number of them caused by other human activities. In fact, the red lights are used for planes, thus they doesn't attract birds and bats. Ie means that the wind farms are not dangerous to the survive of the birds and bats. This contradicts the reading passage's assertion that the wind farms kill many birds and bats because of its dangerous features such as the shape blades.
In addition, the speaker asserts that recent wind farms equip with more silent parts and more attracting design, which can reduce the complain about the noise and sight pollution. Especially, the design of the baldes is improved and it reduces the noise, making quiet atmosphere. This counters the reading passage;s explanation that the noise and sight problems are the one of the most powerful issue, thus people doesn't like to build the wind farms near their location.
Finally, the speaker states that wind farms are economical. This is because of the fact that recent wind frams can be constructed in anywhere, even where having no strong wind. The professor also mentioned that expensive initial costs can be back within three month after finishing the construction of wind farms. This challneges the reading passage's poing that constructure costs are too high to maintain many wind farms because of its traits of which the constructure is limited to specific areas.