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  3. Don’t Rely on Plankton to Save the Planet Encouraging plankton growth in the ocean has been touted by some as a promising way to

Don’t Rely on Plankton to Save the Planet Encouraging plankton growth in the ocean has been touted by some as a promising way to

admin2009-06-15  44
问题                              Don’t Rely on Plankton to Save the Planet
Encouraging plankton growth in the ocean has been touted by some as a promising way to remove carbon dioxide from the atmosphere.(46).
Adding iron to patches of ocean can make plankton bloom temporarily. The microscopic organisms suck up dissolved carbon dioxide from the water, which in turn is replaced by carbon dioxide from the air.(47).
Jorge Sarmiento from Princeton and his colleagues developed a complex computer model to analyse how factors such as ocean chemistry and water circulation would affect the process if 160, 000 square kilometres of ocean were seeded with iron for a month.(48).
In their scenario, which covers an area 10 times as big as the largest experiment of this kind ever proposed, fertilising the ocean removes 1 million tonnes of carbon from the atmosphere -- just 0.2 per cent of the carbon dioxide humankind spews out each month.
Rough estimates in the past have predicted similarly disappointing results.(49)says Sallie Chisholm, an environmental engineer from the Massachusetts Institute of Technology. "But the take-home message is the same.(50)"

A  Its opponents argue, however, that it will stop global warming.
B  Its opponents fear that it will damage the marine ecosystem, and now a computer model shows that the trick would also be remarkably inefficient.
C  As plankton die and settle on the ocean floor, their carbon is supposedly locked up in the seabed,
D  They found that 100 years later only between 2 and 11 per cent of the extra carbon that was originally taken up by plankton had actually been removed from the atmosphere.
E  "These are newer and better models,"
F  Ocean fertilisation is not the answer to global warming.
选项
答案D
解析 第三段的第一句话主要讲Jorge Sarmiento和他的同事用一个复杂的计算机模型分析诸如海洋化学和水流等因素对这种方法的影响。那么接下来的话应当告诉读者他们分析的结果。D是这么说的：他们发现，一百年后原先由浮游生物吸收的额外的碳只有2%至11%是来自大气的。D是结果，因此是正确的答案。
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