▶ Your Answer :
To begin with, the text claims that lab experiments have proved that cloud seeding is advantageous. Experimenters found out that this technique, adding silver iodide to moist air in a freezer, facilitates the process of ice formation and that this means can be applied to the natural environment. The professor, however, argues this point by illustrating that those experiments held in the lab were done in controlled environment. Since nature is totally unpredictable, this method will not be beneficial. In addition to this, although the cloud seeding may prevent the hail, this can also prevent the precipitation which will be a disaster to the farmers.
On top of this, the author contends that cloud seeding was successful in China. Shanghai and Beijing implemented cloud seeding and the method was productively used. Since the cloud seeding was efficient in those cities, this would also be beneficial to US farmland as well. On the contrary, the speaker rebukes, noting that Shanghai and Beijing are large cities which have high level of air pollution. On the other hand, since Midwest of the America has the lower level of air pollution, cloud seeding may not work like those big cities in China.
Lastly, the writer insists that there are in parts of the US where cloud seeding have been already utilized which indicates that the method can be extended to other regions of the country. For example, Kansas used cloud seeding method and researchers attribute the drop in hail over previous year to the method. The lecturer challenges this point by illustrating that the drop of the hail was not unique in Kansas. There were drops in hails in other regions either which means that the decrease of the hail was not because of cloud seeding but just a part of a broader weather phenomenon. |