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The reading passage states that cloud seeding is an ideal way to prevent the damage of hail to crops. However, the lecture claims that there are reasons to question the evidence presented in the reading.
First of all, the author contends that results of laboratory experiments prove that cloud seeding is useful. On the contrary, the professor suggests that maybe in laboratory conditions, silver iodide creates snow instead of hail. However, in real life, the use of silver iodide may prevent all precipitation, including snow, rain, and hail. This will have a negative influence, because it may result in drought and crops will be damaged because of the lack of water.
Moreover, the reading asserts that evidence from Asian countries proves the effectiveness of cloud seeding. By contrast, the professor casts doubt on this argument by pointing out that the results cannot be repeated in the U.S. This is because cloud seeding used in Asian countries take place in urban areas where there is a high level of pollution. She continues to argue that pollution particles creates the right condition for cloud seeding by interacting with clouds and chemicals. Therefore, cloud seeding may not be effective in farming areas in the U.S. where there is little pollution.
Finally, the professor argues against the reading’s statement that local studies provide support for the use of cloud seeding. The professor believes that the reduced hail damage not only took place in the cloud seeding area, but also in neighboring areas east, south, and north to the area. That is to say, the whole region experienced a reduced damage of hail, which may result from natural variations of local weather and has nothing to do with cloud seeding.