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题库 / Prep2007E1-CR-9
Scientists are discussing ways to remove excess carbon dioxide from the atmosphere by increasing the amount that is absorbed by plant life. One plan to accomplish this is to establish giant floating seaweed farms in the oceans. When the seaweed plants die, they will be disposed of by being burned for fuel.
Which of the following, if true, would indicate the most serious weakness in the plan above?
Some areas of ocean in the Southern Hemisphere do not contain sufficient nutrients to support large seaweed farms.
When a seaweed plant is burned, it releases an amount of carbon dioxide comparable to the amount it has absorbed in its lifetime.
Even if seaweed farms prove effective, some people will be reluctant to switch to this new fuel.
Each year about seven billion tons of carbon dioxide are released into the atmosphere but only about five billion tons are absorbed by plant life.
Seaweed farms would make more money by farming seaweed to sell as nutritional supplements than by farming seaweed to sell as fuel.
方案评估
错选D。
D说的是，每年大约有7t的二氧化碳被排放到大气中，但是只有5t被植物吸收了，只是说明一个现象，而并没有详细地评估这个与seaweed plant相关的方案。
B说的是，当水草被燃烧以后它的co2释放量与它这辈子的吸收量是相当的，所以这个方案是无效的。
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