▶ Your Answer :
The reading passage contends that birds' population has decreased by humans' activities. On the other hand, the lecturer brings up several points that contradict this argument.
First, the speaker argues that nowadays green areas in big cities are habitually expanded. Not only that, birds have rapidly adapted urban environments. For example, New York City is famous for a lot of pigeons. This casts doubt on the reading, which states that urbanization lead to a serious lack of birds' habitats.
Second, according to the lecturer, expanding farmlands does not become a serious problem for birds' species. This is because that there are huge forests in many countries such as Canada, Russia and Brazil. Additionally, with development of technology, productivity of food per specific area is increased. This refutes the reading passage's assertion that the needs of farmland for producing food negatively affect birds' population.
The final point made by the lecturer is that usage of chemical insecticides globally has dwindled because it does not effect on the target-insects well. Moreover, DDT that is a kind of very harmful insecticides to human is only utilized to kill mosquitoes, which save a lot of humans through preventing the malaria disease. This counters the writer's claim that usage of chemical insecticides significantly contributes to a crisis of birds.
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