▶ Your Answer :
In the lecture, the speaker maintains that the
theories suggested in the reading are groundless. This casts doubt on the reading passage’s point that
there are practical theories to explain contributing factors of global warming.
To begin with, the lecturer asserts that landfills is
not key factor of the rise in global temperatures. This is because methane account
for less than 9 % of greenhouse made by human. In addition, it make up less
than 1% of the atmosphere. It is impossible to explain that landfills is a significant
contributor to global warming.
On top of that, she argues that cause of global
warming is not deforestation. The reason is that when trees naturally die and
decay, carbon dioxide reenters the atmosphere. On the other hand, the harvesting
by human delays the process because it keep carbon dioxide into stuff like
furniture. This contradicts the reading’s point that deforestation
is cause of global warming.
Finally, the speaker contends that the warming trend is
not related to cycle of climate change. This is because temperatures in the Medieval
Warm Period varied greatly depending on locations. This refutes the reading passage’s claim that natural
cycle of global temperatures cause the warming trend.
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