▶ Your Answer :
In the reading
passage there is ample support for the author’s claim that carbon sequestration
is effective way to delay global warming.
However, the
professor in the lecture gives several reasons as a rebuttal to the author’s
point.
First, the professor
contends that increasing the amount of phytoplankton is ineffective way. Due to
the plankton doesn’t permanently increase. They need iron and nitrogen to grow,
as they grow up the amount of nitrogen would be depleted. And finally the spur
would be stopped. Also, according to study, the plankton sequestrates very little
CO2 compare to amount of deposited iron. This casts doubt on the reading
passage’s claim that raising phytoplankton would decrease CO2 level.
Next, according to
listening comprehension, artificial wetland store carbon 23% less than natural
one. Moreover, it takes long time to build up artificial wetland and to do its
function. So it is late to develop artificial wetland to prevent global
warming. This counters the reading passage’s assertion that creating human-made
wetland can delay reducing CO2 to atmosphere by postponing decomposition.
Finally, the
professor argues that deposing CO2 can be also problematic. Because of Methane
which is evolved when CO2 attaches to coal. Methane also involves carbon as well.
In addition, some CO2 can released, not being attached to coal. This means the
total amount of CO2 might not be reduced at all. This refutes the reading
passage’s suggestion that catching CO2 and pumping them into coal mine would
lessen CO2 by CO2’s feature that when they meet coal, they attach to coal. |