▶ Your Answer :
The reading passage suggests three mothods
that can store carbon dioxide(CO2). However, The speaker brings several points
that can doubt those solutions.
The first point that the speaker made is that
adding iron to the ocean is not a effective way to store CO2 into the ocean. It
is true that if we add iron in to the ocean, number of phytoplankton will be
increase. However, it also needs nitrogen, so the number of phytoplankton will
not increase even though we add iron to the ocean. This refutes the reading
passage's assertion that adding iron can store CO2 into the ocean.
Second, the lecturer argues that building
artificial wetlands is inefficient to reduce CO2. The lecturer adimit that
natural wetlands can store CO2, and artificial wetlands can also store CO2.
However, the amount of CO2 that artificial wet lands can store is much lower
than natural CO2. In addition, artificial wetlands need too much time to store
CO2. This casts doubt on the reading passage's claim that artificial wetland
can be a solution of CO2 problem.
The last point made by the speaker is that
storing CO2 in coal mines is not a good idea. It is true that coal can capture CO2
as the passage claims. However, if coal capture CO2, it produce methane gas. If
we burn the gas, it will emit CO2, so the solution is pointless. Moreover,
abandoned coal mines have small cracks, so if we store CO2 into those mines, it
will leak. |