▶ Your Answer : The reading passage contends that scientists who study the global warming trend have identified several key contributing factors. On the other hand, the lecturer brings up several points that contradict this view. First, the lecturer points that the creation of landfills is not a significant contributor to the rise in global temperatures. It is true that waste buried in landfills produces methane, but recent study shows that methane is very little in greenhouse gas. This refutes the author's point that the creation of landfills is a significant contributor to the rise in global temperatures. Moreover, in the lecture, the point is made that the cause of global warming is not deforestation, which is the harvesting of a large number of trees in a particular area. It is true that trees absorb carbon dioxide but also when tree is died and decay, carbon dioxide re-enter in the atmosphere. Also, it does not traps heat. This casts doubts on the idea in the reading that the cause of global warming is deforestation, which is the harvesting of a large number of trees in a particular area. The final point made by the lecturer is that the current global warming trend is not related to a naturally occurring cycle of climate change. This is because global warming depends on location not cycle. Some place is warm and other place is cool. Also, temperature of at Medieval Warm period is not lower than current. This is different from the passage's view that the current global warming trend is related to a naturally occurring cycle of climate change.
|