题目内容：
第49题___________
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.
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