In the lecture, the speaker contends that methods suggested in reading
passage would not be worked. This casts doubt on the reading’s point that
carbon sequestration can be accomplished in a number of ways.
To begin with, the lecturer asserts that increasing
the number of phytoplankton would not permanent. This is because that massively
multiplied phytoplankton runs out of nitrogen which is needed to survive, so the
population could be decrease again. In addition, according to a recent survey, the
quantity of CO2 which was stored by adding a lot of iron to the ocean would be
infinitesimal relatively. This is contradictory to the reading passage’s claim
that people should increase the amount of phytoplankton by adding iron to the
ocean. Because phytoplankton can absorb carbo hydrate and they sink to the
bottom of the ocean when they die.
On top of that, the speaker maintains that creating
artificial wetlands to sequester CO2 is ineffective. This is since artificial
wetlands could not contain CO2 as much as natural wetlands do. Moreover, according
to the study, it takes too long time for artificial wetlands to develop fully. This
view is in direct opposition to the reading’s assertion that making artificial
wetlands is another excellent way.
Lastly, the lecturer points out that storing
CO2 in abandoned coal mines is problematic. When CO2 bonds with coal, the
process creates lots of methane and the methane contains a lot of co2. As a
result, when they burn, the stored gas would leak into the atmosphere and all
of CO2 would not adhere to the coal. This refutes the reading’s insistence that
the greenhouse gas can be stored in abandoned coal mines.