▶ Your Answer : According to the reading, carbon sequestration can be accomplished in various ways. However, the lecturer argues that it is not feasible. First, the reading says that increasing the amount of phytoplankton by feeding iron is a plausible strategy. Phytoplankton absorb carbon dioxide, and then they sink with carbon dioxide when they die. On the other hand, the lecturer contends that this is unworkable. Increase in phytoplankton results in depletion of nitrogen, which also is needed for survival of phytoplankton, So phytoplankton decease again and there is no effect on carbon dioxide. In addition, a survey says that even if people feed iron to phytoplankton, the amount of carbon dioxide to be sequestered is only 3% of total carbon dioxide. Next, the reading claims that artificial wetland can be used for carbon sequestration. Because wetland is covered by water so it can not absorb oxygen, which decompose organic matter and cause carbon dioxide to be released. In contrast, the lecturer asserts that this method is ineffective. Artificial wetland is 23% less swamp than natural wetland. What is more, it needs almost one hundred years to develop fully and it is too late. Finally, according to the reading, storing carbon dioxide in the coal mine is possible way to sequester carbon dioxide. When carbon dioxide meets coal, they combine and remain in the coal mine. While the lecturer contradicts that this is problematic, suggesting that when they combine, menthane is released, which also involves carbon dioxide. What is more, stored carbon dioxide can leak out of the coal mine and it means that the carbon dioxide level will not be reduced at all.
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