▶ Your Answer :
The lecturer argues that no one knows the
certain factors of global warming. This is because scientists fail to come up
with any convincing reasons. This opposes the reading passage’s claim that
global warming trend has identified several key contributing factors. To begin with, the lecturer mentions that
it is not support that the creation of landfills is significant contributor
factor. This is because the amount of methane accounts less than nine percent
of greenhouse gases produced by human. Moreover, it makes up less than one
percent of the atmosphere. Therefore, it is impossible that landfills are
significant contributors. This refutes the reading passage’s claim that the
creation of landfills is a significant factor to case global warming.
On top of that, the lecturer maintains that
the assertion mentioned in the reading passage does not match. This is because
tress that die and decay absorbed carbon dioxide, and they reenter to
atmosphere. Moreover, harvesting wood can delay this process. Specifically
speaking, furniture contains carbon. This contradicts the reading passage’s
claim that another cause of global warming is deforestation. Lastly, the lecturer claims that Medieval
Warm Period was not a global event. The reason is that North area had warmer
climates, other area actually became cooler from the difference of location.
Moreover, Medieval Warm Period has lower temperature than now, and it indicates
that global trend is caused by something else.
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